Free the command buffer when tabs are switched

gpu/command_buffer/service/gpu_scheduler.h

 // Copyright (c) 2011 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_SCHEDULER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 
 #include <queue>
 
 #include "base/callback.h"
@@ skipping 10 matching lines @@
 
 // This class schedules commands that have been flushed. They are received via
 // a command buffer and forwarded to a command parser. TODO(apatrick): This
 // class should not know about the decoder. Do not add additional dependencies
 // on it.
 class GpuScheduler
     : public CommandBufferEngine,
       public base::SupportsWeakPtr<GpuScheduler> {
  public:
   GpuScheduler(CommandBuffer* command_buffer,
-               gles2::GLES2Decoder* decoder,
-               CommandParser* parser);
+               AsyncAPIInterface* handler,
+               gles2::GLES2Decoder* decoder);
 
   virtual ~GpuScheduler();
 
   void PutChanged();
 
   // Sets whether commands should be processed by this scheduler. Setting to
   // false unschedules. Setting to true reschedules. Whether or not the
   // scheduler is currently scheduled is "reference counted". Every call with
   // false must eventually be paired by a call with true.
   void SetScheduled(bool is_scheduled);
@@ skipping 12 matching lines @@
   virtual Buffer GetSharedMemoryBuffer(int32 shm_id) OVERRIDE;
   virtual void set_token(int32 token) OVERRIDE;
   virtual bool SetGetBuffer(int32 transfer_buffer_id) OVERRIDE;
   virtual bool SetGetOffset(int32 offset) OVERRIDE;
   virtual int32 GetGetOffset() OVERRIDE;
 
   void SetCommandProcessedCallback(const base::Closure& callback);
 
   void DeferToFence(base::Closure task);
 
+  CommandParser* parser() const {
+    return parser_.get();
+  }
+
  private:
   // Polls the fences, invoking callbacks that were waiting to be triggered
   // by them and returns whether all fences were complete.
   bool PollUnscheduleFences();
 
   // The GpuScheduler holds a weak reference to the CommandBuffer. The
   // CommandBuffer owns the GpuScheduler and holds a strong reference to it
   // through the ProcessCommands callback.
   CommandBuffer* command_buffer_;
 
+  // The parser uses this to execute commands.
+  AsyncAPIInterface* handler_;
+
   // Does not own decoder. TODO(apatrick): The GpuScheduler shouldn't need a
   // pointer to the decoder, it is only used to initialize the CommandParser,
   // which could be an argument to the constructor, and to determine the
   // reason for context lost.
   gles2::GLES2Decoder* decoder_;
 
   // TODO(apatrick): The GpuScheduler currently creates and owns the parser.
   // This should be an argument to the constructor.
   scoped_ptr<CommandParser> parser_;
 
   // Greater than zero if this is waiting to be rescheduled before continuing.
   int unscheduled_count_;
 
   // The GpuScheduler will unschedule itself in the event that further GL calls
   // are issued to it before all these fences have been crossed by the GPU.
   struct UnscheduleFence {
     UnscheduleFence();
     ~UnscheduleFence();
 
     uint32 fence;
     base::Closure task;
   };
   std::queue<UnscheduleFence> unschedule_fences_;
 
   base::Closure scheduled_callback_;
   base::Closure command_processed_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuScheduler);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_