[Android WebView] Implement Ubercomp for Render Thread support

android_webview/lib/main/aw_main_delegate.cc

 // Copyright (c) 2012 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/lib/main/aw_main_delegate.h"
 
 #include "android_webview/browser/aw_content_browser_client.h"
 #include "android_webview/browser/browser_view_renderer.h"
 #include "android_webview/browser/gpu_memory_buffer_factory_impl.h"
 #include "android_webview/browser/scoped_allow_wait_for_legacy_web_view_api.h"
+#include "android_webview/common/aw_switches.h"
 #include "android_webview/lib/aw_browser_dependency_factory_impl.h"
 #include "android_webview/native/aw_geolocation_permission_context.h"
 #include "android_webview/native/aw_quota_manager_bridge_impl.h"
 #include "android_webview/native/aw_web_contents_view_delegate.h"
 #include "android_webview/native/aw_web_preferences_populater_impl.h"
 #include "android_webview/native/external_video_surface_container_impl.h"
 #include "android_webview/renderer/aw_content_renderer_client.h"
 #include "base/command_line.h"
 #include "base/cpu.h"
 #include "base/lazy_instance.h"
@@ skipping 38 matching lines @@
   cl->AppendSwitch(switches::kEnableBeginFrameScheduling);
   cl->AppendSwitch(switches::kEnableZeroCopy);
   cl->AppendSwitch(switches::kEnableImplSidePainting);
 
   // WebView uses the Android system's scrollbars and overscroll glow.
   cl->AppendSwitch(switches::kDisableOverscrollEdgeEffect);
 
   // Not yet supported in single-process mode.
   cl->AppendSwitch(switches::kDisableSharedWorkers);
 
+  if (!switches::UbercompEnabled()) {
+    cl->AppendSwitch(switches::kDisableDelegatedRenderer);
+  } else {
+    cl->AppendSwitch(switches::kDisableAccelerated2dCanvas);
+    cl->AppendSwitch(switches::kDisableExperimentalWebGL);
+  }
 
   // File system API not supported (requires some new API; internal bug 6930981)
   cl->AppendSwitch(switches::kDisableFileSystem);
 
   // Fullscreen video with subtitle is not yet supported.
   cl->AppendSwitch(switches::kDisableOverlayFullscreenVideoSubtitle);
 
 #if defined(VIDEO_HOLE)
   // Support EME/L1 with hole-punching.
   cl->AppendSwitch(switches::kMediaDrmEnableNonCompositing);
@@ skipping 76 matching lines @@
 
 #if defined(VIDEO_HOLE)
 content::ExternalVideoSurfaceContainer*
 AwMainDelegate::CreateExternalVideoSurfaceContainer(
     content::WebContents* web_contents) {
   return new ExternalVideoSurfaceContainerImpl(web_contents);
 }
 #endif
 
 }  // namespace android_webview