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

cc/base/switches.cc

Index: cc/base/switches.cc
diff --git a/cc/base/switches.cc b/cc/base/switches.cc
index be4a2c55adfbcb22214a0a92439f59da8fd112e2..ebf345b4158c0859390a8add01d7b76374cc4ed7 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -41,6 +41,12 @@ const char kEnableTopControlsPositionCalculation[] =
 // 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";
 
@@ -187,6 +193,11 @@ bool IsImplSidePaintingEnabled() {
   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();