Delay activation/draw on GPU tile work completion

cc/resources/resource_provider.h

 // Copyright 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 CC_RESOURCES_RESOURCE_PROVIDER_H_
 #define CC_RESOURCES_RESOURCE_PROVIDER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 147 matching lines @@
   // Update pixels from image, copying source_rect (in image) to dest_offset (in
   // the resource).
   void CopyToResource(ResourceId id,
                       const uint8_t* image,
                       const gfx::Size& image_size);
 
   // Generates sync tokesn for resources which need a sync token.
   void GenerateSyncTokenForResource(ResourceId resource_id);
   void GenerateSyncTokenForResources(const ResourceIdArray& resource_ids);
 
+  // Gets the most recent sync token from the indicated resources.
+  gpu::SyncToken GetSyncTokenForResources(const ResourceIdArray& resource_ids);
+
   // Creates accounting for a child. Returns a child ID.
   int CreateChild(const ReturnCallback& return_callback);
 
   // Destroys accounting for the child, deleting all accounted resources.
   void DestroyChild(int child);
 
   // Sets whether resources need sync points set on them when returned to this
   // child. Defaults to true.
   void SetChildNeedsSyncTokens(int child, bool needs_sync_tokens);
 
@@ skipping 575 matching lines @@
   // Set of resource Ids that would like to be notified about promotion hints.
   ResourceIdSet wants_promotion_hints_set_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_PROVIDER_H_