Add a command line flag to enable WebGL overlay support.

content/child/runtime_features.cc

 // Copyright 2013 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 "content/child/runtime_features.h"
 
 #include "base/command_line.h"
 #include "content/common/content_switches_internal.h"
 #include "content/public/common/content_switches.h"
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
@@ skipping 111 matching lines @@
 
   if (command_line.HasSwitch(switches::kEnableExperimentalCanvasFeatures))
     WebRuntimeFeatures::enableExperimentalCanvasFeatures(true);
 
   if (command_line.HasSwitch(switches::kEnableSpeechSynthesis))
     WebRuntimeFeatures::enableSpeechSynthesis(true);
 
   if (command_line.HasSwitch(switches::kEnableWebGLDraftExtensions))
     WebRuntimeFeatures::enableWebGLDraftExtensions(true);
 
+  if (command_line.HasSwitch(switches::kEnableWebGLImageChromium))
+    WebRuntimeFeatures::enableWebGLImageChromium(true);
+
   if (command_line.HasSwitch(switches::kEnableOverlayFullscreenVideo))
     WebRuntimeFeatures::enableOverlayFullscreenVideo(true);
 
   if (ui::IsOverlayScrollbarEnabled())
     WebRuntimeFeatures::enableOverlayScrollbars(true);
 
   if (command_line.HasSwitch(switches::kEnableFastTextAutosizing))
     WebRuntimeFeatures::enableFastTextAutosizing(true);
 
   if (command_line.HasSwitch(switches::kDisableFastTextAutosizing))
@@ skipping 12 matching lines @@
     WebRuntimeFeatures::enableBleedingEdgeFastPaths(true);
 
   if (command_line.HasSwitch(switches::kEnablePreciseMemoryInfo))
     WebRuntimeFeatures::enablePreciseMemoryInfo(true);
 
   if (command_line.HasSwitch(switches::kEnableLayerSquashing))
     WebRuntimeFeatures::enableLayerSquashing(true);
 }
 
 }  // namespace content