Added support for GPU Tracing on mobile devices which support it.

gpu/command_buffer/service/gpu_tracer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains the GPUTrace class.
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GPU_TRACER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_TRACER_H_
 
 #include <string>
 
@@ skipping 15 matching lines @@
 enum GpuTracerSource {
   kTraceGroupInvalid = -1,
 
   kTraceGroupMarker = 0,
   kTraceCHROMIUM = 1,
   kTraceDecoder = 2,
 
   NUM_TRACER_SOURCES
 };
 
+enum GpuTracerType {
+  kTracerTypeInvalid = -1,
+
+  kTracerTypeARBTimer,
+  kTracerTypeDisjointTimer
+};
+
 // Marker structure for a Trace.
 struct TraceMarker {
   TraceMarker(const std::string& name);
   ~TraceMarker();
 
   std::string name_;
   scoped_refptr<GPUTrace> trace_;
 };
 
 // Traces GPU Commands.
 class GPUTracer : public base::SupportsWeakPtr<GPUTracer> {
  public:
   explicit GPUTracer(gles2::GLES2Decoder* decoder);
   ~GPUTracer();
 
   // Scheduled processing in decoder begins.
   bool BeginDecoding();
 
   // Scheduled processing in decoder ends.
   bool EndDecoding();
 
   // Begin a trace marker.
   bool Begin(const std::string& name, GpuTracerSource source);
 
   // End the last started trace marker.
   bool End(GpuTracerSource source);
 
+  // Discard data obtained from current trace.
+  void DiscardTrace();
+
   bool IsTracing();
 
   // Retrieve the name of the current open trace.
   // Returns empty string if no current open trace.
   const std::string& CurrentName() const;
 
  private:
   // Trace Processing.
   scoped_refptr<GPUTrace> CreateTrace(const std::string& name);
   void Process();
   void ProcessTraces();
 
   void CalculateTimerOffset();
   void IssueProcessTask();
 
   scoped_refptr<Outputter> outputter_;
   std::vector<TraceMarker> markers_[NUM_TRACER_SOURCES];
   std::deque<scoped_refptr<GPUTrace> > traces_;
 
   const unsigned char* gpu_trace_srv_category;
   const unsigned char* gpu_trace_dev_category;
   gles2::GLES2Decoder* decoder_;
 
   int64 timer_offset_;
   GpuTracerSource last_tracer_source_;
 
-  bool enabled_;
+  GpuTracerType tracer_type_;
   bool gpu_timing_synced_;
   bool gpu_executing_;
   bool process_posted_;
 
   DISALLOW_COPY_AND_ASSIGN(GPUTracer);
 };
 
 class Outputter : public base::RefCounted<Outputter> {
  public:
   virtual void Trace(const std::string& name,
@@ skipping 19 matching lines @@
 
   base::Thread named_thread_;
   uint64 local_trace_id_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceOutputter);
 };
 
 class GPU_EXPORT GPUTrace
     : public base::RefCounted<GPUTrace> {
  public:
-  explicit GPUTrace(const std::string& name);
   GPUTrace(scoped_refptr<Outputter> outputter,
            const std::string& name,
-           int64 offset);
+           int64 offset,
+           GpuTracerType tracer_type);
 
-  bool IsEnabled() { return enabled_; }
+  bool IsEnabled() { return tracer_type_ != kTracerTypeInvalid; }
   const std::string& name() { return name_; }
 
   void Start();
   void End();
   bool IsAvailable();
   void Process();
+  void DiscardTrace();
 
  private:
   ~GPUTrace();
 
   void Output();
 
   friend class base::RefCounted<GPUTrace>;
 
   std::string name_;
   scoped_refptr<Outputter> outputter_;
 
   int64 offset_;
   int64 start_time_;
   int64 end_time_;
+  GpuTracerType tracer_type_;
   bool end_requested_;
-  bool enabled_;
+  bool discard_trace_;
 
   GLuint queries_[2];
 
   DISALLOW_COPY_AND_ASSIGN(GPUTrace);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_TRACER_H_