cc: Add SwapPromiseManager and SurfaceSequenceGenerator.

cc/trees/layer_tree_host_interface.h

Index: cc/trees/layer_tree_host_interface.h
diff --git a/cc/trees/layer_tree_host_interface.h b/cc/trees/layer_tree_host_interface.h
index 7308787b5ab10b1e31cc8ecbad4aba058a1c0c7f..78a077810aebbfb00960403577574b7de2103546 100644
--- a/cc/trees/layer_tree_host_interface.h
+++ b/cc/trees/layer_tree_host_interface.h
@@ -25,7 +25,7 @@ class LayerTreeDebugState;
 class LayerTreeMutator;
 class LayerTreeSettings;
 class OutputSurface;
-class SwapPromiseMonitor;
+class SwapPromiseManager;
 class TaskRunnerProvider;
 
 // TODO(khushalsagar): Will be renamed to LayerTreeHost.
@@ -49,22 +49,24 @@ class CC_EXPORT LayerTreeHostInterface {
   // thread task runners.
   virtual TaskRunnerProvider* GetTaskRunnerProvider() const = 0;
 
+  // Returns the SwapPromiseManager used to queue SwapPromises to track the
+  // frame stages (commit, activation, SwapBuffers) performed by this
+  // LayerTreeHost. For a detailed explaination on how to use SwapPromises, see
+  // cc/output/swap_promise.h
+  virtual SwapPromiseManager* GetSwapPromiseManager() const = 0;
+
   // Returns the settings used by this host.
   virtual const LayerTreeSettings& GetSettings() const = 0;
 
-  // Sets the client id used to generate the SurfaceId that uniquely identifies
-  // the Surfaces produced by this compositor.
-  virtual void SetSurfaceClientId(uint32_t client_id) = 0;
+  // Returns the SurfaceSequenceGenerator used to generate SurfaceSequences for
+  // Surfaces using CompositorFrames produced by this LayerTreeHost.
+  virtual SurfaceSequenceGenerator* GetSurfaceSequenceGenerator() = 0;
 
   // 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;
-
   // Sets whether the content is suitable to use Gpu Rasterization.
   virtual void SetHasGpuRasterizationTrigger(bool has_trigger) = 0;
 
@@ -169,16 +171,6 @@ class CC_EXPORT LayerTreeHostInterface {
   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;
 };
 
 }  // namespace cc