cc: [WIP] Use worker context and OrderingBarrierCHROMIUM for one-copy.

cc/raster/one_copy_tile_task_worker_pool.h

Index: cc/raster/one_copy_tile_task_worker_pool.h
diff --git a/cc/raster/one_copy_tile_task_worker_pool.h b/cc/raster/one_copy_tile_task_worker_pool.h
index a808fc8828dff45f2e403690df1ad8685340641a..99b04be76876e42d08fef50c939a0ef883322c5e 100644
--- a/cc/raster/one_copy_tile_task_worker_pool.h
+++ b/cc/raster/one_copy_tile_task_worker_pool.h
@@ -62,7 +62,7 @@ class CC_EXPORT OneCopyTileTaskWorkerPool : public TileTaskWorkerPool,
   // Playback raster source and schedule copy of |raster_resource| resource to
   // |output_resource|. Returns a non-zero sequence number for this copy
   // operation.
-  CopySequenceNumber PlaybackAndScheduleCopyOnWorkerThread(
+  void PlaybackAndCopyOnWorkerThread(
       bool reusing_raster_resource,
       scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer>
           raster_resource_write_lock,
@@ -91,28 +91,7 @@ class CC_EXPORT OneCopyTileTaskWorkerPool : public TileTaskWorkerPool,
                             bool have_persistent_gpu_memory_buffers);
 
  private:
-  struct CopyOperation {
-    typedef ScopedPtrDeque<CopyOperation> Deque;
-
-    CopyOperation(scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer>
-                      src_write_lock,
-                  const Resource* src,
-                  const Resource* dst,
-                  const gfx::Rect& rect);
-    ~CopyOperation();
-
-    scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> src_write_lock;
-    const Resource* src;
-    const Resource* dst;
-    const gfx::Rect rect;
-  };
-
   void OnTaskSetFinished(TaskSet task_set);
-  void AdvanceLastFlushedCopyTo(CopySequenceNumber sequence);
-  void IssueCopyOperations(int64 count);
-  void ScheduleCheckForCompletedCopyOperationsWithLockAcquired(
-      bool wait_if_needed);
-  void CheckForCompletedCopyOperations(bool wait_if_needed);
   scoped_refptr<base::trace_event::ConvertableToTraceFormat> StateAsValue()
       const;
   void StagingStateAsValueInto(
@@ -129,8 +108,6 @@ class CC_EXPORT OneCopyTileTaskWorkerPool : public TileTaskWorkerPool,
   const bool have_persistent_gpu_memory_buffers_;
   TaskSetCollection tasks_pending_;
   scoped_refptr<TileTask> task_set_finished_tasks_[kNumberOfTaskSets];
-  CopySequenceNumber last_issued_copy_operation_;
-  CopySequenceNumber last_flushed_copy_operation_;
 
   // Task graph used when scheduling tasks and vector used to gather
   // completed tasks.
@@ -138,15 +115,10 @@ class CC_EXPORT OneCopyTileTaskWorkerPool : public TileTaskWorkerPool,
   Task::Vector completed_tasks_;
 
   base::Lock lock_;
-  // |lock_| must be acquired when accessing the following members.
-  base::ConditionVariable copy_operation_count_cv_;
-  int bytes_scheduled_since_last_flush_;
-  size_t issued_copy_operation_count_;
-  CopyOperation::Deque pending_copy_operations_;
-  CopySequenceNumber next_copy_operation_sequence_;
-  bool check_for_completed_copy_operations_pending_;
-  base::TimeTicks last_check_for_completed_copy_operations_time_;
   bool shutdown_;
+  // Fence used for CopyResource if CHROMIUM_sync_query is not supported.
+  scoped_refptr<ResourceProvider::SynchronousFence> synchronous_fence_;
+  scoped_refptr<ResourceProvider::Fence> read_lock_fence_;
 
   base::WeakPtrFactory<OneCopyTileTaskWorkerPool> weak_ptr_factory_;
   // "raster finished" tasks need their own factory as they need to be