Chromium side plumbing for enabling fixed root background compositing.

content/browser/renderer_host/render_process_host_impl.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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 894 matching lines @@
     switches::kEnableSandboxLogging,
 #endif
     switches::kEnableSoftwareCompositingGLAdapter,
     switches::kEnableStatsTable,
     switches::kEnableThreadedCompositing,
     switches::kEnableCompositingForFixedPosition,
     switches::kEnableHighDpiCompositingForFixedPosition,
     switches::kDisableCompositingForFixedPosition,
     switches::kEnableCompositingForTransition,
     switches::kDisableCompositingForTransition,
+    switches::kEnableAcceleratedFixedRootBackground,
+    switches::kDisableAcceleratedFixedRootBackground,
     switches::kDisableThreadedCompositing,
     switches::kDisableTouchAdjustment,
     switches::kDefaultTileWidth,
     switches::kDefaultTileHeight,
     switches::kMaxUntiledLayerWidth,
     switches::kMaxUntiledLayerHeight,
     switches::kEnableViewport,
     switches::kEnableOpusPlayback,
     switches::kEnableVp9Playback,
     switches::kEnableVp8AlphaPlayback,
@@ skipping 870 matching lines @@
       continue;
 
     RenderViewHost* rvh =
         RenderViewHost::From(const_cast<RenderWidgetHost*>(widget));
 
     rvh->UpdateWebkitPreferences(rvh->GetWebkitPreferences());
   }
 }
 
 }  // namespace content