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

shell/BUILD.gn

Index: shell/BUILD.gn
diff --git a/shell/BUILD.gn b/shell/BUILD.gn
index 981df804fab39300f37e84cbec30816c78849b0e..16d100f86bd68a80ce37ae79fbc4fdb594237c4c 100644
--- a/shell/BUILD.gn
+++ b/shell/BUILD.gn
@@ -227,6 +227,8 @@ source_set("parent_lib") {
       "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",
@@ -291,6 +293,7 @@ if (is_android) {
       "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",
     ]
@@ -341,6 +344,7 @@ if (is_android) {
       "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",