Refactored GLContext to own GPUTiming which spawn GPUTimingClients.

gpu/perftests/measurements.h

Index: gpu/perftests/measurements.h
diff --git a/gpu/perftests/measurements.h b/gpu/perftests/measurements.h
index 1f72b0028ce646513cef56316ea1c1f8b1acfffe..e66864b167d3921fbd9f2750087a775640c7b345 100644
--- a/gpu/perftests/measurements.h
+++ b/gpu/perftests/measurements.h
@@ -11,7 +11,7 @@
 #include "base/time/time.h"
 
 namespace gpu {
-class GPUTiming;
+class GPUTimingClient;
 class GPUTimer;
 struct Measurement {
   Measurement();
@@ -37,7 +37,7 @@ struct Measurement {
 // creation up to when Record is called.
 class MeasurementTimers {
  public:
-  explicit MeasurementTimers(GPUTiming* gpu_timing);
+  explicit MeasurementTimers(GPUTimingClient* gpu_timing_client);
   void Record();
   Measurement GetAsMeasurement(const std::string& name);
   ~MeasurementTimers();