[DO NOT MERGE] React sync for revisions 6bf5e85...aa94237

[hramos]

This sync includes the following changes:

• 45fc46bfa: 16.8.1 packages ////
• f2e2637c8: Backwards compat fix for ReactCurrentDispatcher on older react versions (undefined is not an object (evaluating 'this._onEmoticonPress.bind') react native "0.45.1"  #14770) ////
• 1107b9673: [TestUtils.act] warn when using TestUtils.act in node ( Trying to add unknown view tag: 682 #14768) ////
• 0975ea327: eslint-plugin-react-hooks v1.0.0 ////
• bc9818f24: Scheduler.unstable_next (FlatList onRefresh not called on pull up. #14756) ////
• ce6ecd3fb: Add 16.8.0 changelog and update some READMEs (KeyboardAvoidingView Warnings #14692) ////
• 008a2ab9c: 16.8.0 ////
• d1326f466: [TestUtils.act] fix return result checking (Cannot connect to remote debugger when using android real device with charlse proxy enabled. #14758) ////
• 267ed9814: expose TestUtils.act() for batching actions in tests (Unable to call API with Fetch, with React native version 0.45. [TypeError: Network request failed] #14744) ////
• fb3f7bfde: Avoid importing Scheduler directly ([Website] Increase text size, rename Tutorial, update nav... #14757) ////
• e602b5291: Use SameValue instead of === to check for dispatchAction equivalence ("No such file or directory" error while deploying project on device #14752) ////
• e489c3f9c: Update the version with Hooks proposal in README (Running project with release config fails  #14751) ////
• c21c41ecf: Tweak invalid Hook warning and error (ViewPagerAndroid nested ViewPagerAndroid #14747) ////
• fec00a869: Typo in comment (IOS Production Build #14739) ////
• 66eb29374: Restrict effect return type to a function or nothing (why roundToNearestPixel use 0.4? #14119) ////
• 51c07912a: Warn when second argument is passed to useCallback (Replace React.createClass with create-react-class #14729) ////
• 70d407583: Move Hook mismatch warning to first mismatch site (Implement onKeyPress Android #14720) ////
• ba6477aa3: Improve Reducer Hook's lazy init API (Update NativeModulesAndroid.md #14723) ////
• cb1ff430e: Phased dispatcher (RN 44 don't open release apk #14701) ////
• 9d483dcfd: Spelling abitrarily -> arbitrarily (improve choco command #14710) ////
• e19c9e106: Fix issue with multiple code branches in hooks linter ([BUG] FlatList ItemSeparatorComponent not work correctly. #14661) ////
• f11a9c1cb: State update bug in concurrent mode (Promise doesn't work with alert/Alert.alert #14698) ////
• e679a4b6e: Fix typo in code comment (added chromium support for devTools on linux #14696) ////
• 8bcc88f2e: Make all readContext() and Hook-in-a-Hook checks DEV-only (init a new project and build failed #14677) ////
• 6cb26774e: Enable hooks! (Image show .gif problem #14679) ////
• 73962c366: Revert "Revert "Double-render function components with Hooks in DEV in StrictMode" (Fix Apple TV compile errors #14652)" (Third party podspecs should only include required files #14654) ////
• 994439228: Put DEV-only code into DEV blocks (fix error caused by first argument short when calling warning function #14673) ////
• f0befae65: Tweak context invariant message ([Android]View positioned as absolute was clipped by parent view #14671) ////
• a129259ad: Disallow reading context during useMemo etc ([Android] A ClassCastException thrown by the ARTGroupShadowNode class #14653) ////
• c068d31cc: Add unit tests for concurrent mode event dispatching (How to open Settings of Android Phone on a button click in our Android App #14415) //<Sebastian Markbåge>//
• 38247cba3: --save is no longer needed (Post RN 44.2 Update UnableToResolve 'ActivityIndicator' #14302) ////
• 3f0bcaf0d: Importing React for the first example. (App crashed in Android 7 devices #14346) //<Ramón Chancay Ortega>//
• ecd919a2f: RFC: warn when returning different hooks on subsequent renders (React Native WebView onNavigationStateChange event value is incorrect on Android #14585) ////
• 3fbebb2a0: Revert "Double-render function components with Hooks in DEV in StrictMode" (Fix Apple TV compile errors #14652) ////
• 5fce6488c: Revert "Disallow reading context during useMemo etc" (React Native TextInput in ListView value by state is stuck #14651) ////
• fe2ecd276: Add test coverage for readContext() on the server (How to run or import remote(server) js file in react-native android #14649) ////
• 8f45a7fdc: Warn about incorrect use of useImperativeHandle() ( Please use the latest react@16.0.0-alpha.12 specification for some react-native controls #14647) ////
• 1fcbd2243: Disallow reading context during useMemo etc (transform.forEach is not a function. (In 'transform.forEach', 'transform.forEach' is undefined) #14648) ////
• 2a084f51a: Warn about refs on lazy function components (TextInput horizontal padding does not update on iOS #14645) ////
• b5a3df6e8: Fix typo (Fix inverted FlatList for Android: add perspective transform #14560) ////
• 9c146e675: fix typo (Document Android native communication #14316) ////
• baa6d40fc: Mention forwardRef() in errors and warnings (Cannot read property 'string' of undefined | React.PropTypes | LayoutPropTypes.js #14644) ////
• a1414e894: Double-render function components with Hooks in DEV in StrictMode (Cannot read property 'string' of undefined | React.PropTypes | LayoutPropTypes.js #14643) ////
• 10a7a5b5c: Fix synchronous thenable rejection (TypeError: expected dynamic type double', but had type null' (constructing arguments for UiManager.dispatchViewManagerCommand at argument index 0) #14633) ////
• a2fa6eb98: Move lazy._result assignment (Update of react gradle to increase node heap #14632) ////
• 9120f6c2d: Support sync thenables for lazy() (Document URI for Android asset folder images #14626) ////
• b66e6e41e: Add directory details to the package.json of all packages ([iOS] app hang when include CJK characters multiline TextInput  #14628) ////
• 177fb7635: Warn when second callback is passed to setState/dispatch in Hooks (react.children.only expected to receive a single reactelement child #14625) ////
• d17d0b99c: Use public context.report interface in eslint rules (Corner case crashes in RCTImageLoader and RCTNetworkTask #14623) ////
• 4f332885a: Fix shallow renderer set instance state after gDSFP before calling sCU (Can't run tvOS target for newly generated RN project #14613) //<Yi-Shan, Chen>//
• e1cd83e49: Throw an error when using hooks inside useMemo/useState/useReducer, or .memo's comparator ("react-native init project" works for other path, but causes trouble if previous troubled project path reused #14608) ////
• be457ca68: Small tweaks to SSR to match react-native link issue after upgrade to react-native-fbsdk 0.6.1 #14594 (DEPRECATION: Make NetInfo API cross platform and expose whether connection is 2g/3g/4g #14618) ////
• 17d70df91: Warn when mixing createRoot() and old APIs (Dealing with FileProvider (Android) globally within React Native and libraries #14615) ////
• 4feab7fc9: Add hooks support to ReactShallowRenderer (Use possessive 'its' not 'it's' #14567) ////
• 1454a8be0: Don't bother comparing constructor when deps are not provided (react-native link issue after upgrade to react-native-fbsdk 0.6.1 #14594) ////
• 71b64d521: Warn if number of hooks increases (initialScrollIndex bug #14591) ////
• 790c8ef04: Allow useReducer to bail out of rendering by returning previous state ([Website] Clean up the help page #14569) ////
• 7ab8a8e97: Added Flow type to keep hooks dispatchers in-sync (react-native 4.5.1 upgrade issue #14599) ////
• 4392e3821: useDebugValue should throw if used in a class component ([iOS][v0.44] Unable to archive - 'React/RCTBundleURLProvider.h' file not found in appDelegate.m #14601) ////
• 153a0b598: Add noop useDebugValue hook to partial/server renderer ([iOS] Overwriting "multipart/mixed" content-type if set explicitely #14597) ////
• 7ad9806d1: Tweak to avoid property read (react native app not building latest android.index.js and doesnt have a watchman #14593) ////
• 0fc154751: Avoid new Set([iterable]) for thenables (How do i get local mac address of device bluetooth? #14592) ////
• edb1f5956: Support configurable labels for custom hooks ([VirtualList] Fix off-by-one errors when rendering window-sized items. #14559) ////
• 3e15b1c69: make a fork for ReactCurrentDispatcher (PropTypes from React package on 0.45.1 release builds failing #14588) ////
• 0005d1e3f: Fix typo (Facebook login in a webview #14576) ////
• f290138d3: react-debug-tools accepts currentDispatcher ref as param (WebView.props.source.uri is never updated #14556) ////
• b4ad8e947: rename useImperativeMethods -> useImperativeHandle (java.lang.IllegalStateException:  #14565) ////
• ab03e3d65: Inject ReactCurrentDispatcher ref to DevTools (Webview can't call onLoad's callback when source is HTML source code in iOS, but, it'ok for Android. #14550) ////
• 19ef0ec11: Separate current owner and dispatcher ([0.45.1] Android release build failed #14548) ////
• a9b035b0c: Separate Object.is polyfill ([Packager] Only a single simulator gets LiveReload/HMR connections in Xcode 9 #14334) ////
• 547e059f0: Simplify wording of key warning (Windows---Reacr-native :Could not install the app on the device, read the error above for details. #14503) ////
• 3494ee57e: Update ReactUpdateQueue.js ([FlatList] always mount and unmount some top items even if initialScrollIndex was set #14521) ////
• 659c13963: Update ReactFiberScheduler.js (fix init #14477) ////
• c695b2384: React v16.7.0 ////
• 1c5aa2f23: Move SchedulerFeatureFlags fork to src directory to fix lint ////
• 653bc582f: Create separate SchedulerFeatureFlags instead of using ReactFeatureFlags (Clearer code in Button.js #14455) ////
• 8bfef0da5: Make scheduler debugging feature flag static ////
• 4a1072194: Memoize promise listeners to prevent exponential growth (flexWrap has definite, reproducible buggy behavior (!) #14429) ////
• 535804f5c: Removed Fabric-specific feature flag files and updated Rollup to use the (non-Fabric) React Native flag files. (Add a section about Platform.Version on iOS #14437) ////
• 2743fb7b2: Enable hooks by default for FB React Native renderer (Native Animated - Call x.__makeNative before super.__makeNative #14435) ////
• 7325ebe4d: Inject overrideProps() fn to DevTools ("Warning: SceneView has a method called shouldComponentUpdate()", used with react-native-router-flux #14427) ////
• a22880e5e: Add support for Suspense & lazy() to the react-is package ([Master Task] Print: Entry, ":CFBundleIdentifier", Does Not Exist #14423) ////
• 947bddd5c: Remove redundant argument of getPlugins function (iOS app crashes on launch in xcode #14419) ////
• 8df4d59be: Implement pauseExecution, continueExecution, dumpQueue for Scheduler (react-native packager(or to be more precise - jest-haste-map) module resolution issue with 3rd party lib. #14053) ////
• 5bb4ad737: Added ErrorBoundary tests for useEffect and useLayoutEffect (scrollResponder.scrollResponderScrollNativeHandleToKeyboard crops FlatList content on focus #14401) ////
• 98eb5ae53: TestRenderer toJSON should not expose the Array wrapper Suspense uses for hidden trees ([SectionList] Cannot scroll to top of a SectionList with Header #14392) ////
• 39489e767: Enable hooks in fabric (Fix InspectorPackagerConnection creates too many Threads when WebSo… #14301) ////
• 1dc108e58: Tweaked wording for v8 "performance cliff" issue ////

Release Notes:
[GENERAL] [Changed] - React sync for revisions 6bf5e85...aa94237 (React 16.8.1)

Differential Revision: D13976467

[hramos]

This is an export of the internal diff that syncs React 16.8 to React Native. This is for CI testing purposes only.

[cpojer]

Will close this because we aren't going to merge it and you got results from CI, but feel free to reopen if you need to push to it again.

[hramos]

We have a new external facing change to .eslintrc. CI is running against these changes in https://circleci.com/workflow-run/ee145cd5-85a5-4b4e-933f-d29dfdd489a4

[react-native-bot]

@cpojer merged commit ccefc70 into facebook:master.