gpu: Record GL state to trace

gpu/command_buffer/service/gpu_state_tracer.h

Index: gpu/command_buffer/service/gpu_state_tracer.h
diff --git a/gpu/command_buffer/service/gpu_state_tracer.h b/gpu/command_buffer/service/gpu_state_tracer.h
new file mode 100644
index 0000000000000000000000000000000000000000..bad98d20faffab714320b8bd012a0ed8f93fab84
--- /dev/null
+++ b/gpu/command_buffer/service/gpu_state_tracer.h
@@ -0,0 +1,39 @@
+// Copyright (c) 2013 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.
+
+#ifndef GPU_COMMAND_BUFFER_SERVICE_GPU_STATE_TRACER_H_
+#define GPU_COMMAND_BUFFER_SERVICE_GPU_STATE_TRACER_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace gfx {
+class Size;
+}
+
+namespace gpu {
+namespace gles2 {
+
+class ContextState;
+
+// Saves GPU state such as framebuffer contents while tracing.
+class GPUStateTracer {
+ public:
+  static scoped_ptr<GPUStateTracer> Create(const ContextState* state);
+  ~GPUStateTracer();
+
+  // Take a state snapshot with a screenshot of the currently bound framebuffer.
+  void TakeSnapshotWithCurrentFramebuffer(const gfx::Size& size);
+
+ private:
+  explicit GPUStateTracer(const ContextState* state);
+
+  const ContextState* state_;
+  DISALLOW_COPY_AND_ASSIGN(GPUStateTracer);
+};
+
+}  // namespace gles2
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_STATE_TRACER_H_