Use thread with looper and native message loop for vsync service.

shell/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//mojo/public/mojo.gni")
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//mojo/tools/embed/rules.gni")
 import("//testing/test.gni")
@@ skipping 209 matching lines @@
   ]
 
   if (is_android) {
     sources += [
       "android/android_handler.cc",
       "android/android_handler.h",
       "android/android_handler_loader.cc",
       "android/android_handler_loader.h",
       "android/java_application_loader.cc",
       "android/java_application_loader.h",
+      "android/native_handler_thread.cc",
+      "android/native_handler_thread.h",
       "android/native_viewport_application_loader.cc",
       "android/native_viewport_application_loader.h",
       "android/ui_application_loader_android.cc",
       "android/ui_application_loader_android.h",
       "android/url_response_disk_cache_delegate_impl.cc",
       "android/url_response_disk_cache_delegate_impl.h",
     ]
 
     deps += [
       ":jni_headers",
@@ skipping 44 matching lines @@
   # this file.
   check_includes = false
 }
 
 if (is_android) {
   generate_jni("jni_headers") {
     sources = [
       "android/apk/src/org/chromium/mojo/shell/AndroidHandler.java",
       "android/apk/src/org/chromium/mojo/shell/Bootstrap.java",
       "android/apk/src/org/chromium/mojo/shell/JavaApplicationRegistry.java",
+      "android/apk/src/org/chromium/mojo/shell/NativeHandlerThread.java",
       "android/apk/src/org/chromium/mojo/shell/ShellService.java",
       "android/tests/src/org/chromium/mojo/shell/ShellTestBase.java",
     ]
     jni_package = "mojo/shell"
   }
 
   android_library("bootstrap_java") {
     java_files = [ "android/apk/src/org/chromium/mojo/shell/Bootstrap.java" ]
 
     deps = [
@@ skipping 30 matching lines @@
       "android/apk/src/org/chromium/mojo/shell/AndroidHandler.java",
       "android/apk/src/org/chromium/mojo/shell/BaseActivity.java",
       "android/apk/src/org/chromium/mojo/shell/FileHelper.java",
       "android/apk/src/org/chromium/mojo/shell/InputFactory.java",
       "android/apk/src/org/chromium/mojo/shell/IntentReceiverActivity.java",
       "android/apk/src/org/chromium/mojo/shell/IntentReceiverRegistry.java",
       "android/apk/src/org/chromium/mojo/shell/JavaApplicationRegistry.java",
       "android/apk/src/org/chromium/mojo/shell/KeyboardFactory.java",
       "android/apk/src/org/chromium/mojo/shell/MojoShellActivity.java",
       "android/apk/src/org/chromium/mojo/shell/MojoShellApplication.java",
+      "android/apk/src/org/chromium/mojo/shell/NativeHandlerThread.java",
       "android/apk/src/org/chromium/mojo/shell/NativeViewportSupportApplicationDelegate.java",
       "android/apk/src/org/chromium/mojo/shell/NfcApplicationDelegate.java",
       "android/apk/src/org/chromium/mojo/shell/NfcDbManager.java",
       "android/apk/src/org/chromium/mojo/shell/NfcImpl.java",
       "android/apk/src/org/chromium/mojo/shell/NfcReceiverActivity.java",
       "android/apk/src/org/chromium/mojo/shell/NfcServiceFactoryBinder.java",
       "android/apk/src/org/chromium/mojo/shell/SharingActivity.java",
       "android/apk/src/org/chromium/mojo/shell/SharingApplicationDelegate.java",
       "android/apk/src/org/chromium/mojo/shell/ShellService.java",
       "android/apk/src/org/chromium/mojo/shell/ViewportActivity.java",
@@ skipping 354 matching lines @@
       "${root_out_dir}/libmojo_shell.so",
     ]
   } else {
     sources += [ "${root_out_dir}/mojo_shell" ]
   }
 
   outputs = [
     "${root_out_dir}/symbols/{{source_file_part}}",
   ]
 }