cc/blimp: Add synchronization for scroll/scale state.

cc/trees/property_tree.h

 // Copyright 2014 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_TREES_PROPERTY_TREE_H_
 #define CC_TREES_PROPERTY_TREE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 434 matching lines @@
                              LayerTreeImpl* layer_tree_impl);
   ScrollOffsetMap& scroll_offset_map();
   const ScrollOffsetMap& scroll_offset_map() const;
   void ApplySentScrollDeltasFromAbortedCommit();
   bool SetBaseScrollOffset(int layer_id,
                            const gfx::ScrollOffset& scroll_offset);
   bool SetScrollOffset(int layer_id, const gfx::ScrollOffset& scroll_offset);
   void SetScrollOffsetClobberActiveValue(int layer_id) {
     synced_scroll_offset(layer_id)->set_clobber_active_value();
   }
+  void AddUnappliedScrollOffsetDeltaToPendingTree(
+      int layer_id,
+      const gfx::ScrollOffset& scroll_offset_delta);
   bool UpdateScrollOffsetBaseForTesting(int layer_id,
                                         const gfx::ScrollOffset& offset);
   bool SetScrollOffsetDeltaForTesting(int layer_id,
                                       const gfx::Vector2dF& delta);
   const gfx::ScrollOffset GetScrollOffsetBaseForTesting(int layer_id) const;
   const gfx::ScrollOffset GetScrollOffsetDeltaForTesting(int layer_id) const;
   void CollectScrollDeltasForTesting();
 
   void DistributeScroll(ScrollNode* scroll_node, ScrollState* scroll_state);
   gfx::Vector2dF ScrollBy(ScrollNode* scroll_node,
@@ skipping 209 matching lines @@
   DrawTransforms& GetDrawTransforms(int transform_id, int effect_id) const;
   DrawTransformData& FetchDrawTransformsDataFromCache(int transform_id,
                                                       int effect_id) const;
 
   PropertyTreesCachedData cached_data_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_H_