Add command line and flag option to force 2D canvas to use display lists

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 322 matching lines @@
 //  3. Disabled always.
 const char kEnableCompositingForTransition[] =
      "enable-transition-compositing";
 
 // Defer image decoding in WebKit until painting.
 const char kEnableDeferredImageDecoding[]   = "enable-deferred-image-decoding";
 
 // Enables delegated renderer.
 const char kEnableDelegatedRenderer[]       = "enable-delegated-renderer";
 
-// Enables display list based 2d canvas implementation.
+// Enables display list based 2d canvas implementation. Options:
+//  1. Enable: allow browser to use display list for 2d canvas (browser makes
+//     decision).
+//  2. Force: browser always uses display list for 2d canvas.
 const char kEnableDisplayList2dCanvas[]     = "enable-display-list-2d-canvas";
-const char kDisableDisplayList2dCanvas[]     = "disable-display-list-2d-canvas";
+const char kForceDisplayList2dCanvas[]      = "force-display-list-2d-canvas";
+const char kDisableDisplayList2dCanvas[]    = "disable-display-list-2d-canvas";
 
 // Enables restarting interrupted downloads.
 const char kEnableDownloadResumption[]      = "enable-download-resumption";
 
 // Enables support for Encrypted Media Extensions (e.g. MediaKeys).
 const char kEnableEncryptedMedia[] = "enable-encrypted-media";
 
 // Enable experimental canvas features, e.g. canvas 2D context attributes
 const char kEnableExperimentalCanvasFeatures[] =
     "enable-experimental-canvas-features";
@@ skipping 622 matching lines @@
 #endif
 
 #if defined(ENABLE_PLUGINS)
 // Enables the plugin power saver feature.
 const char kEnablePluginPowerSaver[] = "enable-plugin-power-saver";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches