Added preliminary support for tile rasterization with Ganesh

cc/base/switches.cc

Index: cc/base/switches.cc
diff --git a/cc/base/switches.cc b/cc/base/switches.cc
index 752abc607729186d3090c70a75c2e1c80610b949..370d411a9ffe149f3f942a7911e2f27e76edf95f 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -171,6 +171,7 @@ bool IsLCDTextEnabled() {
 }
 
 namespace {
+
 bool CheckImplSidePaintingStatus() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 
@@ -185,6 +186,12 @@ bool CheckImplSidePaintingStatus() {
   return false;
 #endif
 }
+
+bool CheckGPURasterizationStatus() {
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  return command_line.HasSwitch(cc::switches::kEnableGPURasterization);
+}
+
 }  // namespace
 
 bool IsImplSidePaintingEnabled() {
@@ -193,8 +200,8 @@ bool IsImplSidePaintingEnabled() {
 }
 
 bool IsGPURasterizationEnabled() {
-  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
-  return command_line.HasSwitch(cc::switches::kEnableGPURasterization);
+  static bool enabled = CheckGPURasterizationStatus();
+  return enabled;
 }
 
 bool IsMapImageEnabled() {