Enable gpu Debug markers if tracing category skia.gpu is enabled

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 103d76e8a20c3a2608deb9c10db50f3d58e0f916..88f6a4f51c7a196bf9ab70cec79a6d211f0d1376 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -928,11 +928,6 @@ public:
     // Called by tests that draw directly to the context via GrDrawTarget
     void getTestTarget(GrTestTarget*);
 
-    // Functions for managing gpu trace markers
-    bool isGpuTracingEnabled() const { return fGpuTracingEnabled; }
-    void enableGpuTracing() { fGpuTracingEnabled = true; }
-    void disableGpuTracing() { fGpuTracingEnabled = false; }
-
     void addGpuTraceMarker(const GrGpuTraceMarker* marker);
     void removeGpuTraceMarker(const GrGpuTraceMarker* marker);
 
@@ -999,8 +994,6 @@ private:
 
     int                             fMaxTextureSizeOverride;
 
-    bool                            fGpuTracingEnabled;
-
     GrContext(); // init must be called after the constructor.
     bool init(GrBackend, GrBackendContext);