Add a command line flag to enable WebGL overlay support.

content/public/common/content_switches.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 "content/public/common/content_switches.h"
 
 #include "base/command_line.h"
 
 namespace switches {
 
@@ skipping 556 matching lines @@
 
 // Enable the Vtune profiler support.
 const char kEnableVtune[]                   = "enable-vtune-support";
 
 // Enable SVG Animations on the Web Animations model.
 const char kEnableWebAnimationsSVG[]        = "enable-web-animations-svg";
 
 // Enables WebGL extensions not yet approved by the community.
 const char kEnableWebGLDraftExtensions[] = "enable-webgl-draft-extensions";
 
+// Enables WebGL rendering into a scanout buffer for overlay support.
+const char kEnableWebGLImageChromium[] = "enable-webgl-image-chromium";
+
 // Enables Web MIDI API.
 const char kEnableWebMIDI[]                 = "enable-web-midi";
 
 // Enable rasterizer that writes directly to GPU memory associated with tiles.
 const char kEnableZeroCopy[]                = "enable-zero-copy";
 
 // Load NPAPI plugins from the specified directory.
 const char kExtraPluginDir[]                = "extra-plugin-dir";
 
 // Enable force_compositing_mode in layout tests.
@@ skipping 409 matching lines @@
 
 // Disables support for Core Animation plugins. This is triggered when
 // accelerated compositing is disabled. See http://crbug.com/122430 .
 const char kDisableCoreAnimationPlugins[] =
     "disable-core-animation-plugins";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches