--enable-gpu-rasterization flag for turning on hybrid ganesh mode

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 {
@@ skipping 23 matching lines @@
 const char kEnableImplSidePainting[] = "enable-impl-side-painting";
 
 const char kEnableTopControlsPositionCalculation[] =
     "enable-top-controls-position-calculation";
 
 // For any layers that can get drawn directly to screen, draw them with the Skia
 // GPU backend.  Only valid with gl rendering + threaded compositing + impl-side
 // painting.
 const char kForceDirectLayerDrawing[] = "force-direct-layer-drawing";
 
+// Allow heuristics to determine when a layer tile should be drawn with
+// the Skia GPU backend.  Only valid with gl rendering + threaded compositing +

[enne (OOO), 2013/11/25 22:43:32]

To be future proof, I wouldn't mention threaded compositing here.  Impl-side
painting depends on threaded compositing (for now), but
--enable-gpu-rasterization only does indirectly because it depends on impl-side
painting.

[Vangelis Kokkevis, 2013/11/25 22:53:52]

And  instead of "gl rendering" this should probably be "GPU accelerated
compositing" 

+// impl-side painting.
+

[enne (OOO), 2013/11/25 22:43:32]

nit: empty line doesn't match style of rest of the file

+const char kEnableGPURasterization[] = "enable-gpu-rasterization";
+
 // The height of the movable top controls.
 const char kTopControlsHeight[] = "top-controls-height";
 
 // Percentage of the top controls need to be hidden before they will auto hide.
 const char kTopControlsHideThreshold[] = "top-controls-hide-threshold";
 
 // Percentage of the top controls need to be shown before they will auto show.
 const char kTopControlsShowThreshold[] = "top-controls-show-threshold";
 
 // Number of worker threads used to rasterize content.
@@ skipping 126 matching lines @@
   return false;
 #endif
 }
 }  // namespace
 
 bool IsImplSidePaintingEnabled() {
   static bool enabled = CheckImplSidePaintingStatus();
   return enabled;
 }
 
+bool IsGPURasterizationEnabled() {
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  return command_line.HasSwitch(cc::switches::kEnableGPURasterization);
+}
+
 bool IsMapImageEnabled() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 
   if (command_line.HasSwitch(cc::switches::kDisableMapImage))
     return false;
   else if (command_line.HasSwitch(cc::switches::kEnableMapImage))
     return true;
 
   return false;
 }
 
 }  // namespace switches
 }  // namespace cc