--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..752abc607729186d3090c70a75c2e1c80610b949 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -41,6 +41,11 @@ 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 GPU accelerated compositing +
+// impl-side painting.
+const char kEnableGPURasterization[] = "enable-gpu-rasterization";
+
 // The height of the movable top controls.
 const char kTopControlsHeight[] = "top-controls-height";
 
@@ -187,6 +192,11 @@ 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();