Make correct GL context current during gpu_tracer processing

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>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread.h"
+#include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 #include "gpu/gpu_export.h"
 #include "ui/gl/gl_bindings.h"
 
 namespace gpu {
 namespace gles2 {
 
 // Traces GPU Commands.
 class GPUTracer {
  public:
-  static scoped_ptr<GPUTracer> Create();
+  static scoped_ptr<GPUTracer> Create(
+      base::WeakPtr<gles2::GLES2Decoder> decoder);
 
-  GPUTracer() {}
-  virtual ~GPUTracer() {}
+  explicit GPUTracer(base::WeakPtr<gles2::GLES2Decoder> decoder);
+  virtual ~GPUTracer();
 
   // Begin a trace.
   virtual bool Begin(const std::string& name) = 0;
 
   // End the last started trace.
   virtual bool End() = 0;
 
   // Retrieve the name of the current open trace.
   // Returns empty string if no current open trace.
   virtual const std::string& CurrentName() const = 0;
 
+  base::WeakPtr<gles2::GLES2Decoder> decoder_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(GPUTracer);
 };
 
 class Outputter : public base::RefCounted<Outputter> {
  public:
   virtual void Trace(const std::string& name,
                      int64 start_time,
                      int64 end_time) = 0;
 
@@ skipping 72 matching lines @@
 
   GLuint queries_[2];
 
   DISALLOW_COPY_AND_ASSIGN(GLARBTimerTrace);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_TRACER_H_