cc: Partial tile update for one-copy raster.

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 0c1397a0aee78276febfb17113fd03eb2092ef8e..7b76c273466357fd60366234b600ce42b88800d4 100644
--- a/cc/raster/one_copy_tile_task_worker_pool.h
+++ b/cc/raster/one_copy_tile_task_worker_pool.h
@@ -39,7 +39,8 @@ class CC_EXPORT OneCopyTileTaskWorkerPool : public TileTaskWorkerPool,
       ContextProvider* context_provider,
       ResourceProvider* resource_provider,
       ResourcePool* resource_pool,
-      size_t max_bytes_per_copy_operation);
+      size_t max_bytes_per_copy_operation,
+      bool have_persistent_gpu_memory_buffers);
 
   // Overridden from TileTaskWorkerPool:
   TileTaskRunner* AsTileTaskRunner() override;
@@ -53,43 +54,54 @@ class CC_EXPORT OneCopyTileTaskWorkerPool : public TileTaskWorkerPool,
 
   // Overridden from TileTaskClient:
   scoped_ptr<RasterBuffer> AcquireBufferForRaster(
-      const Resource* resource) override;
+      const Resource* resource,
+      uint64_t new_content_id,
+      uint64_t previous_content_id) override;
   void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) override;
 
-  // Playback raster source and schedule copy of |src| resource to |dst|
-  // resource. Returns a non-zero sequence number for this copy operation.
+  // 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(
-      scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> write_lock,
-      const Resource* src,
-      const Resource* dst,
+      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& rect,
+      const gfx::Rect& raster_full_rect,
+      const gfx::Rect& raster_dirty_rect,
       float scale);
 
   // 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,
-                            size_t max_bytes_per_copy_operation);
+                            size_t max_bytes_per_copy_operation,
+                            bool have_persistent_gpu_memory_buffers);
 
  private:
   struct CopyOperation {
     typedef ScopedPtrDeque<CopyOperation> Deque;
 
-    CopyOperation(
-        scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> 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);
     ~CopyOperation();
 
-    scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> write_lock;
+    scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> src_write_lock;
     const Resource* src;
     const Resource* dst;
     const gfx::Rect rect;
@@ -114,6 +126,7 @@ class CC_EXPORT OneCopyTileTaskWorkerPool : public TileTaskWorkerPool,
   ResourceProvider* resource_provider_;
   ResourcePool* resource_pool_;
   const size_t max_bytes_per_copy_operation_;
+  const bool have_persistent_gpu_memory_buffers_;
   TaskSetCollection tasks_pending_;
   scoped_refptr<TileTask> task_set_finished_tasks_[kNumberOfTaskSets];
   CopySequenceNumber last_issued_copy_operation_;