cc: Add SwapPromiseManager and SurfaceSequenceGenerator.

cc/trees/layer_tree_host_interface.h

 // Copyright 2016 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_HOST_INTERFACE_H_
 #define CC_TREES_LAYER_TREE_HOST_INTERFACE_H_
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/debug/micro_benchmark.h"
@@ skipping 52 matching lines @@
 
   // Sets the LayerTreeMutator interface used to directly mutate the compositor
   // state on the compositor thread. (Compositor-Worker)
   virtual void SetLayerTreeMutator(
       std::unique_ptr<LayerTreeMutator> mutator) = 0;
 
   // Call this function when you expect there to be a swap buffer.
   // See swap_promise.h for how to use SwapPromise.
   virtual void QueueSwapPromise(std::unique_ptr<SwapPromise> swap_promise) = 0;
 
+  // Returns the SwapPromiseManager used to create SwapPromiseMonitors for this
+  // host.
+  virtual SwapPromiseManager* GetSwapPromiseManager() const = 0;
+
   // Sets whether the content is suitable to use Gpu Rasterization.
   virtual void SetHasGpuRasterizationTrigger(bool has_trigger) = 0;
 
   // Visibility and OutputSurface -------------------------------
 
   virtual void SetVisible(bool visible) = 0;
   virtual bool IsVisible() const = 0;
 
   // Called in response to an OutputSurface request made to the client using
   // LayerTreeHostClient::RequestNewOutputSurface. The client will be informed
@@ skipping 87 matching lines @@
       std::unique_ptr<base::Value> value,
       const MicroBenchmark::DoneCallback& callback) = 0;
 
   // Returns true if the message was successfully delivered and handled.
   virtual bool SendMessageToMicroBenchmark(
       int id,
       std::unique_ptr<base::Value> value) = 0;
 
   // Methods used internally in cc. These are not intended to be a part of the
   // public API for use by the embedder ----------------------
-
-  // When a SwapPromiseMonitor is created on the main thread, it calls
-  // InsertSwapPromiseMonitor() to register itself with LayerTreeHost.
-  // When the monitor is destroyed, it calls RemoveSwapPromiseMonitor()
-  // to unregister itself.
-  virtual void InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor) = 0;
-  virtual void RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor) = 0;
+  virtual SurfaceSequenceGenerator* GetSurfaceSequenceGenerator() = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_INTERFACE_H_