content: Add switch to enable checker-imaging.

cc/base/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 "cc/base/switches.h"
 
 #include "base/command_line.h"
 
 namespace cc {
 namespace switches {
 
 const char kDisableThreadedAnimation[] = "disable-threaded-animation";
 
 // Disables layer-edge anti-aliasing in the compositor.
 const char kDisableCompositedAntialiasing[] =
     "disable-composited-antialiasing";
 
 // Disables sending the next BeginMainFrame before the previous commit
 // activates. Overrides the kEnableMainFrameBeforeActivation flag.
 const char kDisableMainFrameBeforeActivation[] =
     "disable-main-frame-before-activation";
 
 // Enables sending the next BeginMainFrame before the previous commit activates.
 const char kEnableMainFrameBeforeActivation[] =
     "enable-main-frame-before-activation";
 
+// Enables defering image decodes to the image decode service.
+const char kEnableCheckerImaging[] = "enable-checker-imaging";
+
 // Percentage of the browser controls need to be hidden before they will auto
 // hide.
 const char kBrowserControlsHideThreshold[] = "top-controls-hide-threshold";
 
 // Percentage of the browser controls need to be shown before they will auto
 // show.
 const char kBrowserControlsShowThreshold[] = "top-controls-show-threshold";
 
 // Re-rasters everything multiple times to simulate a much slower machine.
 // Give a scale factor to cause raster to take that many times longer to
@@ skipping 71 matching lines @@
 const char kCCLayerTreeTestNoTimeout[] = "cc-layer-tree-test-no-timeout";
 
 // Increases timeout for memory checkers.
 const char kCCLayerTreeTestLongTimeout[] = "cc-layer-tree-test-long-timeout";
 
 // Makes pixel tests write their output instead of read it.
 const char kCCRebaselinePixeltests[] = "cc-rebaseline-pixeltests";
 
 }  // namespace switches
 }  // namespace cc