Use BraveMainDelegate for brave_browser_tests

So far, ChromeMainDelegate is used.

test/BUILD.gn

@@ -69,6 +69,32 @@ group("brave_browser_tests_deps") {
   ]
 }
 
+static_library("browser_test_support") {
+  testonly = true
+  deps = [
+    "//chrome/test:test_support",
+  ]
+
+  sources = [
+    "base/brave_test_launcher_delegate.cc",
+    "base/brave_test_launcher_delegate.h",
+    "//brave/app/brave_main_delegate.cc",
+    "//brave/app/brave_main_delegate.h",
+  ]
+}
+
+static_library("browser_tests_runner") {
+  testonly = true
+
+  deps = [
+    ":browser_test_support",
+  ]
+
+  sources = [
+    "base/browser_tests_main.cc",
+  ]
+}
+
 test("brave_browser_tests") {
   sources = [
     "//brave/browser/extensions/api/brave_shields_api_browsertest.cc",
@@ -90,9 +116,9 @@ test("brave_browser_tests") {
   defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
   deps = [
     "//chrome/browser/ui",
-    "//chrome/test:browser_tests_runner",
     "//ppapi/buildflags",
     ":brave_browser_tests_deps",
+    ":browser_tests_runner",
   ]
   data_deps = [
     "//ppapi:ppapi_tests",

test/base/brave_test_launcher_delegate.cc

@@ -0,0 +1,18 @@
+/* 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/. */
+
+#include "brave/test/base/brave_test_launcher_delegate.h"
+
+#include "brave/app/brave_main_delegate.h"
+
+BraveTestLauncherDelegate::BraveTestLauncherDelegate(
+    ChromeTestSuiteRunner* runner)
+    : ChromeTestLauncherDelegate(runner) {}
+
+BraveTestLauncherDelegate::~BraveTestLauncherDelegate() = default;
+
+content::ContentMainDelegate*
+BraveTestLauncherDelegate::CreateContentMainDelegate() {
+  return new BraveMainDelegate();
+}

test/base/brave_test_launcher_delegate.h

@@ -0,0 +1,24 @@
+/* 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/. */
+
+#ifndef BRAVE_TEST_BASE_BRAVE_TEST_LAUNCHER_H_
+#define BRAVE_TEST_BASE_BRAVE_TEST_LAUNCHER_H_
+
+#include "chrome/test/base/chrome_test_launcher.h"
+#include "base/macros.h"
+
+class BraveTestLauncherDelegate : public ChromeTestLauncherDelegate {
+ public:
+  // Does not take ownership of ChromeTestSuiteRunner.
+  explicit BraveTestLauncherDelegate(ChromeTestSuiteRunner* runner);
+  ~BraveTestLauncherDelegate() override;
+
+ private:
+  // ChromeLauncherDelegate:
+  content::ContentMainDelegate* CreateContentMainDelegate() override;
+
+  DISALLOW_COPY_AND_ASSIGN(BraveTestLauncherDelegate);
+};
+
+#endif  // BRAVE_TEST_BASE_BRAVE_TEST_LAUNCHER_H_

test/base/browser_tests_main.cc

@@ -0,0 +1,36 @@
+/* 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/. */
+
+#include "base/command_line.h"
+#include "base/test/launcher/test_launcher.h"
+#include "brave/test/base/brave_test_launcher_delegate.h"
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include "base/test/test_switches.h"
+#include "base/win/win_util.h"
+#endif  // defined(OS_WIN)
+
+int main(int argc, char** argv) {
+  base::CommandLine::Init(argc, argv);
+  size_t parallel_jobs = base::NumParallelJobs();
+  if (parallel_jobs == 0U) {
+    return 1;
+  } else if (parallel_jobs > 1U) {
+    parallel_jobs /= 2U;
+  }
+
+#if defined(OS_WIN)
+  // Enable high-DPI for interactive tests where the user is expected to
+  // manually verify results.
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kTestLauncherInteractive)) {
+    base::win::EnableHighDPISupport();
+  }
+#endif  // defined(OS_WIN)
+
+  ChromeTestSuiteRunner runner;
+  BraveTestLauncherDelegate delegate(&runner);
+  return LaunchChromeTests(parallel_jobs, &delegate, argc, argv);
+}