[Android WebView] Implement Ubercomp for Render Thread support

android_webview/common/aw_switches.cc

+// 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.
+
+#include "android_webview/common/aw_switches.h"
+
+#include "base/command_line.h"
+
+namespace switches {
+
+const char kEnableUbercomp[] = "enable-ubercomp";
+
+bool UbercompEnabled() {
+  static bool ubercomp_enabled =
+      CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableUbercomp);
+  return ubercomp_enabled;
+}
+
+}  // namespace switches