Add SwapPromise support to LayerTreeHost and LayerTreeImpl

cc/trees/layer_tree_impl.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_TREES_LAYER_TREE_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <list>
 #include <string>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
 #include "base/values.h"
+#include "cc/base/scoped_ptr_vector.h"
+#include "cc/base/swap_promise.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/resources/ui_resource_client.h"
 #include "ui/events/latency_info.h"
 
 #if defined(COMPILER_GCC)
 namespace BASE_HASH_NAMESPACE {
 template<>
 struct hash<cc::LayerImpl*> {
   size_t operator()(cc::LayerImpl* ptr) const {
     return hash<size_t>()(reinterpret_cast<size_t>(ptr));
@@ skipping 178 matching lines @@
   // Useful for debug assertions, probably shouldn't be used for anything else.
   Proxy* proxy() const;
 
   void SetRootLayerScrollOffsetDelegate(
       LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate);
 
   void SetLatencyInfo(const ui::LatencyInfo& latency_info);
   const ui::LatencyInfo& GetLatencyInfo();
   void ClearLatencyInfo();
 
+  // Call this function when you expect there to be a swap buffer.
+  // See swap_promise.h for how to use SwapPromise.
+  void QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise);
+
+  // Take the |new_swap_promise| and append it to |swap_promise_list_|.
+  void PassSwapPromises(ScopedPtrVector<SwapPromise>* new_swap_promise);
+  void FinishSwapPromises();
+  void BreakSwapPromises(SwapPromise::DidNotSwapReason reason);
+
   void DidModifyTilePriorities();
 
   ResourceProvider::ResourceId ResourceIdForUIResource(UIResourceId uid) const;
   void ProcessUIResourceRequestQueue();
 
   bool IsUIResourceOpaque(UIResourceId uid) const;
 
   void AddLayerWithCopyOutputRequest(LayerImpl* layer);
   void RemoveLayerWithCopyOutputRequest(LayerImpl* layer);
   const std::vector<LayerImpl*> LayersWithCopyOutputRequest() const;
@@ skipping 42 matching lines @@
   bool needs_update_draw_properties_;
 
   // In impl-side painting mode, this is true when the tree may contain
   // structural differences relative to the active tree.
   bool needs_full_tree_sync_;
 
   bool next_activation_forces_redraw_;
 
   ui::LatencyInfo latency_info_;
 
+  ScopedPtrVector<SwapPromise> swap_promise_list_;
+
   UIResourceRequestQueue ui_resource_request_queue_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_