Added a unique command buffer ID for command buffers.

content/common/gpu/gpu_command_buffer_stub.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.
 
 #ifndef CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_
 #define CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 98 matching lines @@
     return scheduler_.get() && scheduler_->IsPreempted();
   }
 
   // Whether there are commands in the buffer that haven't been processed.
   bool HasUnprocessedCommands();
 
   gpu::gles2::GLES2Decoder* decoder() const { return decoder_.get(); }
   gpu::GpuScheduler* scheduler() const { return scheduler_.get(); }
   GpuChannel* channel() const { return channel_; }
 
+  // Unique command buffer ID for this command buffer stub.
+  uint64_t command_buffer_id() const { return command_buffer_id_; }
+
   // Identifies the target surface.
   int32 surface_id() const { return surface_id_; }
 
   // Identifies the various GpuCommandBufferStubs in the GPU process belonging
   // to the same renderer process.
   int32 route_id() const { return route_id_; }
 
   // Identifies the stream for this command buffer.
   int32 stream_id() const { return stream_id_; }
 
@@ skipping 123 matching lines @@
   // The group of contexts that share namespaces with this context.
   scoped_refptr<gpu::gles2::ContextGroup> context_group_;
 
   bool initialized_;
   gfx::GLSurfaceHandle handle_;
   gfx::Size initial_size_;
   gpu::gles2::DisallowedFeatures disallowed_features_;
   std::vector<int32> requested_attribs_;
   gfx::GpuPreference gpu_preference_;
   bool use_virtualized_gl_context_;
+  const uint64_t command_buffer_id_;
   const int32 stream_id_;
   const int32 route_id_;
   const int32 surface_id_;
   bool software_;
   uint32 last_flush_count_;
 
   scoped_ptr<gpu::CommandBufferService> command_buffer_;
   scoped_ptr<gpu::gles2::GLES2Decoder> decoder_;
   scoped_ptr<gpu::GpuScheduler> scheduler_;
   scoped_refptr<gfx::GLSurface> surface_;
@@ skipping 26 matching lines @@
   size_t total_gpu_memory_;
   scoped_ptr<WaitForCommandState> wait_for_token_;
   scoped_ptr<WaitForCommandState> wait_for_get_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuCommandBufferStub);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_