Revert "Remove impl-side-painting from about:flags"

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"
 #include "base/metrics/field_trial.h"
 
 namespace switches {
@@ skipping 143 matching lines @@
 
 // Suppresses hang monitor dialogs in renderer processes.  This may allow slow
 // unload handlers on a page to prevent the tab from closing, but the Task
 // Manager can be used to terminate the offending process in this case.
 const char kDisableHangMonitor[]            = "disable-hang-monitor";
 
 // Disable the RenderThread's HistogramCustomizer.
 const char kDisableHistogramCustomizer[]    = "disable-histogram-customizer";
 
 // Paint content on the main thread instead of the compositor thread.
+// Overrides the kEnableImplSidePainting flag.
 const char kDisableImplSidePainting[]       = "disable-impl-side-painting";
 
 // Prevent Java from running.
 const char kDisableJava[]                   = "disable-java";
 
 // Don't kill a child process when it sends a bad IPC message.  Apart
 // from testing, it is a bad idea from a security perspective to enable
 // this switch.
 const char kDisableKillAfterBadIPC[]        = "disable-kill-after-bad-ipc";
 
@@ skipping 160 matching lines @@
 // impl-side painting.
 const char kEnableGpuRasterization[]        = "enable-gpu-rasterization";
 
 // When using CPU rasterizing generate low resolution tiling. Low res
 // tiles may be displayed during fast scrolls especially on slower devices.
 const char kEnableLowResTiling[] = "enable-low-res-tiling";
 
 // Dynamically apply color profiles to web content images.
 const char kEnableImageColorProfiles[]      = "enable-image-color-profiles";
 
+// Paint content on the compositor thread instead of the main thread.
+const char kEnableImplSidePainting[]        = "enable-impl-side-painting";
+
 // Force logging to be enabled.  Logging is disabled by default in release
 // builds.
 const char kEnableLogging[]                 = "enable-logging";
 
 // Enables the memory benchmarking extension
 const char kEnableMemoryBenchmarking[]      = "enable-memory-benchmarking";
 
 // Enables the network information API.
 const char kEnableNetworkInformation[]      = "enable-network-information";
 
@@ skipping 615 matching lines @@
   if (cmd_line->HasSwitch(kDisableWin32kRendererLockDown))
     return false;
   // Default.
   return group_name == "Enabled";
 }
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches