Make custom private page with DDG switch

android/brave_java_sources.gni

@@ -13,6 +13,7 @@ brave_java_sources = [
   "../../brave/android/java/org/chromium/chrome/browser/appmenu/BraveShieldsMenuHandler.java",
   "../../brave/android/java/org/chromium/chrome/browser/appmenu/BraveShieldsMenuObserver.java",
   "../../brave/android/java/org/chromium/chrome/browser/document/BraveLauncherActivity.java",
+  "../../brave/android/java/org/chromium/chrome/browser/ntp/BraveDuckDuckGoOfferView.java",
   "../../brave/android/java/org/chromium/chrome/browser/ntp/BraveNewTabPageLayout.java",
   "../../brave/android/java/org/chromium/chrome/browser/ntp/BraveNewTabPageView.java",
   "../../brave/android/java/org/chromium/chrome/browser/partnercustomizations/CloseBraveManager.java",

android/java/org/chromium/chrome/browser/ntp/BraveDuckDuckGoOfferView.java

@@ -0,0 +1,92 @@
+/* Copyright (c) 2019 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.chromium.chrome.browser.ntp;
+
+import android.content.Context;
+import android.content.DialogInterface;
+import android.support.v7.app.AlertDialog;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.LinearLayout;
+
+import org.chromium.base.ContextUtils;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.preferences.BraveSearchEngineUtils;
+import org.chromium.chrome.browser.search_engines.TemplateUrlServiceFactory;
+import org.chromium.components.search_engines.TemplateUrl;
+
+import java.util.List;
+
+public class BraveDuckDuckGoOfferView extends LinearLayout {
+    public static String DDG_SEARCH_ENGINE_SHORT_NAME = "DuckDuckGo";
+    public static String PREF_DDG_OFFER_SHOWN = "brave_ddg_offer_shown";
+
+    private Context mContext;
+    private View mDDGOfferLink;
+
+    public BraveDuckDuckGoOfferView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        mContext = context;
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+
+        mDDGOfferLink = findViewById(R.id.ddg_offer_link);
+        mDDGOfferLink.setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                showDDGOffer(true);
+            }
+        });
+
+        showDDGOffer(false);
+    }
+
+    private void showDDGOffer(boolean forceShow) {
+        if (BraveSearchEngineUtils.getDSEShortName(true).equals(DDG_SEARCH_ENGINE_SHORT_NAME)) {
+            mDDGOfferLink.setVisibility(View.GONE);
+            return;
+        }
+        if (!forceShow
+                && ContextUtils.getAppSharedPreferences().getBoolean(PREF_DDG_OFFER_SHOWN, false)) {
+            return;
+        }
+        ContextUtils.getAppSharedPreferences()
+                .edit()
+                .putBoolean(PREF_DDG_OFFER_SHOWN, true)
+                .apply();
+        new AlertDialog.Builder(mContext, R.style.BraveDialogTheme)
+                .setView(R.layout.ddg_offer_layout)
+                .setPositiveButton(R.string.ddg_offer_positive,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                TemplateUrl templateUrl =
+                                        getTemplateUrlByShortName(DDG_SEARCH_ENGINE_SHORT_NAME);
+                                if (templateUrl != null) {
+                                    BraveSearchEngineUtils.setDSEPrefs(templateUrl, true);
+                                    BraveSearchEngineUtils.updateActiveDSE(true);
+                                }
+                                mDDGOfferLink.setVisibility(View.GONE);
+                            }
+                        })
+                .setNegativeButton(R.string.ddg_offer_negative, null)
+                .show();
+    }
+
+    private TemplateUrl getTemplateUrlByShortName(String name) {
+        List<TemplateUrl> templateUrls = TemplateUrlServiceFactory.get().getTemplateUrls();
+        for (int index = 0; index < templateUrls.size(); ++index) {
+          TemplateUrl templateUrl = templateUrls.get(index);
+          if (templateUrl.getShortName().equals(name)) {
+              return templateUrl;
+          }
+        }
+        return null;
+    }
+}

android/java/res/layout/brave_ddg_offer_link.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2019 The Brave Authors. All rights reserved.
+     This Source Code Form is subject to the terms of the Mozilla Public
+     License, v. 2.0. If a copy of the MPL was not distributed with this file,
+     You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto"
+      android:orientation="horizontal"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content" >
+
+  <TextView
+      android:id="@+id/ddg_offer_link"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:gravity="center_vertical"
+      android:text="@string/ddg_offer_link"
+      android:textColor="@color/modern_grey_400"
+      android:drawableStart="@drawable/duckduckgo"
+      android:drawablePadding="15dp"
+      android:layout_marginTop="15dp"
+      android:textSize="28sp"
+      android:scaleX="0.5"
+      android:scaleY="0.5" />
+
+</LinearLayout>

android/java/res/layout/ddg_offer_layout.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:orientation="vertical" >
+
+    <ImageView android:id="@+id/ddg_logo"
+        android:scaleType="fitCenter"
+        android:src="@drawable/duckduckgo"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:contentDescription="@null"
+        android:layout_gravity="center_horizontal"
+        android:paddingTop="15dip"
+        android:paddingStart="15dip"
+        android:paddingEnd="15dip" />
+
+    <TextView android:id="@+id/ddg_offer_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/ddg_offer_title"
+        android:orientation="horizontal"
+        android:layout_gravity="center_horizontal"
+        android:paddingTop="15dip"
+        android:paddingStart="15dip"
+        android:paddingEnd="15dip"
+        android:textSize="22sp"
+        android:textStyle="bold" />
+
+    <TextView android:id="@+id/ddg_offer_text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/ddg_offer_text"
+        android:orientation="horizontal"
+        android:layout_gravity="center_horizontal"
+        android:paddingTop="15dip"
+        android:paddingStart="15dip"
+        android:paddingEnd="15dip" />
+
+</LinearLayout>

android/java/res/values/brave_styles.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2014 The Chromium Authors. All rights reserved.
+     Use of this source code is governed by a BSD-style license that can be
+     found in the LICENSE file. -->
+
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <style name="BraveSwitchTheme">
+        <item name="colorControlActivated">#fb542b</item>
+    </style>
+    <style name="BraveDialogTheme" parent="Theme.AppCompat.Light.Dialog.Alert">
+        <item name="windowNoTitle">true</item>
+    </style>
+</resources>

android/java/strings/android_brave_strings.grd

@@ -234,6 +234,21 @@ This file contains all "about" strings.  It is set to NOT be translated, in tran
       <message name="IDS_MENU_BRAVE_REWARDS" desc="Title for brave rewards menu item">
         Brave Rewards
       </message>
+      <message name="IDS_DDG_OFFER_TITLE" desc="Title for DDG offer.">
+        Private search with DuckDuckGo?
+      </message>
+      <message name="IDS_DDG_OFFER_TEXT" desc="Text for DDG offer.">
+        With private search, Brave will use DuckDuckGo to answer your searches while you are in this private tab. DuckDuckGo is a search engine that does not track your search history, enabling you to search privately.
+      </message>
+      <message name="IDS_DDG_OFFER_POSITIVE" desc="Positive button text for DDG offer.">
+        Yes
+      </message>
+      <message name="IDS_DDG_OFFER_NEGATIVE" desc="Negative button text for DDG offer.">
+        No
+      </message>
+      <message name="IDS_DDG_OFFER_LINK" desc="Text for DDG offer link.">
+        Learn about private search with DuckDuckGo
+      </message>
     </messages>
   </release>
 </grit>

patches/chrome-android-java-res-layout-new_tab_page_incognito.xml.patch

@@ -0,0 +1,12 @@
+diff --git a/chrome/android/java/res/layout/new_tab_page_incognito.xml b/chrome/android/java/res/layout/new_tab_page_incognito.xml
+index b294fa17a33e3c089babc00ca4d17b2a62a9e8f3..26efb010768cc6cf6f0ab64c7c3fbc57a54e65e4 100644
+--- a/chrome/android/java/res/layout/new_tab_page_incognito.xml
++++ b/chrome/android/java/res/layout/new_tab_page_incognito.xml
+@@ -82,6 +82,7 @@
+                 android:textAppearance="@style/TextAppearance.IncognitoNewTabLearnMoreLinkModern"
+                 android:lineSpacingExtra="@dimen/md_incognito_ntp_line_spacing" />
+
++	    <org.chromium.chrome.browser.ntp.BraveDuckDuckGoOfferView android:id="@+id/brave_duck_duck_go_offer_view" android:layout_width="match_parent" android:layout_height="match_parent" > <include layout="@layout/brave_ddg_offer_link" /> </org.chromium.chrome.browser.ntp.BraveDuckDuckGoOfferView>
+         </LinearLayout>
+
+     </org.chromium.chrome.browser.ntp.NewTabPageScrollView>