Add Gpu Tracing to Ganesh

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 1834586578281fc6fcea3a02e7f4909bfb0f69c5..313a7c072beb662f62401f6458ef930b2437ca48 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -855,6 +855,11 @@ public:
     // Called by tests that draw directly to the context via GrDrawTarget
     void getTestTarget(GrTestTarget*);
 
+    // Functions for managing gpu trace markers
+    bool gpuTracingEnabled() const { return fGpuTracingEnabled; }

[bsalomon, 2014/03/17 17:50:38]

Can we make it isGpuTracingEnabled()?

+    void turnOnGpuTracing() { fGpuTracingEnabled = true; }
+    void turnOffGpuTracing() { fGpuTracingEnabled = false; }
+
     /**
      * Stencil buffers add themselves to the cache using addStencilBuffer. findStencilBuffer is
      * called to check the cache for a SB that matches an RT's criteria.
@@ -918,6 +923,8 @@ private:
 
     int                             fMaxTextureSizeOverride;
 
+    bool                            fGpuTracingEnabled;
+
     GrContext(); // init must be called after the constructor.
     bool init(GrBackend, GrBackendContext);