Revert of cc: Use worker context for one-copy tile initialization.

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 6554fccb256945ee2573f495407b856a8b20a449..4e050b4c2023a6bba1ca0d706e404bd6fba5706b 100644
--- a/cc/raster/one_copy_tile_task_worker_pool.h
+++ b/cc/raster/one_copy_tile_task_worker_pool.h
@@ -5,12 +5,8 @@
 #ifndef CC_RASTER_ONE_COPY_TILE_TASK_WORKER_POOL_H_
 #define CC_RASTER_ONE_COPY_TILE_TASK_WORKER_POOL_H_
 
-#include <set>
-
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
-#include "base/time/time.h"
-#include "base/trace_event/memory_dump_provider.h"
 #include "base/values.h"
 #include "cc/base/scoped_ptr_deque.h"
 #include "cc/output/context_provider.h"
@@ -25,20 +21,15 @@
 }
 }
 
-namespace gpu {
-namespace gles2 {
-class GLES2Interface;
-}
-}
-
 namespace cc {
 class ResourcePool;
+class ScopedResource;
 
-class CC_EXPORT OneCopyTileTaskWorkerPool
-    : public TileTaskWorkerPool,
-      public TileTaskRunner,
-      public TileTaskClient,
-      public base::trace_event::MemoryDumpProvider {
+typedef int64 CopySequenceNumber;
+
+class CC_EXPORT OneCopyTileTaskWorkerPool : public TileTaskWorkerPool,
+                                            public TileTaskRunner,
+                                            public TileTaskClient {
  public:
   ~OneCopyTileTaskWorkerPool() override;
 
@@ -47,10 +38,9 @@
       TaskGraphRunner* task_graph_runner,
       ContextProvider* context_provider,
       ResourceProvider* resource_provider,
+      ResourcePool* resource_pool,
       int max_copy_texture_chromium_size,
-      bool use_persistent_gpu_memory_buffers,
-      unsigned image_target,
-      int max_staging_buffers);
+      bool have_persistent_gpu_memory_buffers);
 
   // Overridden from TileTaskWorkerPool:
   TileTaskRunner* AsTileTaskRunner() override;
@@ -70,58 +60,61 @@
       uint64_t previous_content_id) override;
   void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) override;
 
-  // Overridden from base::trace_event::MemoryDumpProvider:
-  bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
-                    base::trace_event::ProcessMemoryDump* pmd) override;
-
-  // Playback raster source and copy result into |resource|.
-  void PlaybackAndCopyOnWorkerThread(
-      const Resource* resource,
-      const ResourceProvider::ScopedWriteLockGL* resource_lock,
+  // 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(
+      bool reusing_raster_resource,
+      scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer>
+          raster_resource_write_lock,
+      const Resource* raster_resource,
+      const Resource* output_resource,
       const RasterSource* raster_source,
       const gfx::Rect& raster_full_rect,
       const gfx::Rect& raster_dirty_rect,
       float scale,
-      bool include_images,
-      uint64_t resource_content_id,
-      uint64_t previous_content_id);
+      bool include_images);
+
+  // Issues copy operations until |sequence| has been processed. This will
+  // return immediately if |sequence| has already been processed.
+  void AdvanceLastIssuedCopyTo(CopySequenceNumber sequence);
+
+  bool have_persistent_gpu_memory_buffers() const {
+    return have_persistent_gpu_memory_buffers_;
+  }
 
  protected:
   OneCopyTileTaskWorkerPool(base::SequencedTaskRunner* task_runner,
                             TaskGraphRunner* task_graph_runner,
+                            ContextProvider* context_provider,
                             ResourceProvider* resource_provider,
+                            ResourcePool* resource_pool,
                             int max_copy_texture_chromium_size,
-                            bool use_persistent_gpu_memory_buffers,
-                            unsigned image_target,
-                            int max_staging_buffers);
+                            bool have_persistent_gpu_memory_buffers);
 
  private:
-  struct StagingBuffer {
-    explicit StagingBuffer(const gfx::Size& size);
-    ~StagingBuffer();
+  struct CopyOperation {
+    typedef ScopedPtrDeque<CopyOperation> Deque;
 
-    void DestroyGLResources(gpu::gles2::GLES2Interface* gl);
-    void OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd,
-                      ResourceFormat format,
-                      bool is_free) const;
+    CopyOperation(scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer>
+                      src_write_lock,
+                  const Resource* src,
+                  const Resource* dst,
+                  const gfx::Rect& rect);
+    ~CopyOperation();
 
-    const gfx::Size size;
-    scoped_ptr<gfx::GpuMemoryBuffer> gpu_memory_buffer;
-    base::TimeTicks last_usage;
-    unsigned texture_id;
-    unsigned image_id;
-    unsigned query_id;
-    uint64_t content_id;
+    scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> src_write_lock;
+    const Resource* src;
+    const Resource* dst;
+    const gfx::Rect rect;
   };
 
-  scoped_ptr<StagingBuffer> AcquireStagingBuffer(const Resource* resource,
-                                                 uint64_t previous_content_id);
-  base::TimeTicks GetUsageTimeForLRUBuffer();
-  void ScheduleReduceMemoryUsage();
-  void ReduceMemoryUsage();
-  void ReleaseBuffersNotUsedSince(base::TimeTicks time);
-
   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(
@@ -131,30 +124,31 @@
   TaskGraphRunner* task_graph_runner_;
   const NamespaceToken namespace_token_;
   TileTaskRunnerClient* client_;
-  ResourceProvider* const resource_provider_;
+  ContextProvider* context_provider_;
+  ResourceProvider* resource_provider_;
+  ResourcePool* resource_pool_;
   const int max_bytes_per_copy_operation_;
-  const bool use_persistent_gpu_memory_buffers_;
-  const unsigned image_target_;
+  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.
   TaskGraph graph_;
   Task::Vector completed_tasks_;
 
-  mutable base::Lock lock_;
+  base::Lock lock_;
   // |lock_| must be acquired when accessing the following members.
-  using StagingBufferSet = std::set<StagingBuffer*>;
-  StagingBufferSet buffers_;
-  using StagingBufferDeque = ScopedPtrDeque<StagingBuffer>;
-  StagingBufferDeque free_buffers_;
-  StagingBufferDeque busy_buffers_;
+  base::ConditionVariable copy_operation_count_cv_;
   int bytes_scheduled_since_last_flush_;
-  size_t max_staging_buffers_;
-  const base::TimeDelta staging_buffer_expiration_delay_;
-  bool reduce_memory_usage_pending_;
-  base::Closure reduce_memory_usage_callback_;
+  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_;
 
   base::WeakPtrFactory<OneCopyTileTaskWorkerPool> weak_ptr_factory_;
   // "raster finished" tasks need their own factory as they need to be