sync compositor: Merge input path with chrome

content/renderer/input/input_handler_manager.h

Index: content/renderer/input/input_handler_manager.h
diff --git a/content/renderer/input/input_handler_manager.h b/content/renderer/input/input_handler_manager.h
index c8bfb75262e6d3be82b6afda9e59568086c39140..f50b868ef83e59ab3d8700dd628863fb72966f7e 100644
--- a/content/renderer/input/input_handler_manager.h
+++ b/content/renderer/input/input_handler_manager.h
@@ -32,6 +32,7 @@ class RendererScheduler;
 namespace content {
 
 class InputHandlerWrapper;
+class InputHandlerManagerSyncHandlerProxyClient;
 class InputHandlerManagerClient;
 struct DidOverscrollParams;
 
@@ -46,6 +47,7 @@ class InputHandlerManager {
   InputHandlerManager(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       InputHandlerManagerClient* client,
+      InputHandlerManagerSyncHandlerProxyClient* sync_handler_client,
       scheduler::RendererScheduler* renderer_scheduler);
   ~InputHandlerManager();
 
@@ -105,9 +107,12 @@ class InputHandlerManager {
       InputHandlerMap;
   InputHandlerMap input_handlers_;
 
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  InputHandlerManagerClient* client_;
-  scheduler::RendererScheduler* renderer_scheduler_;  // Not owned.
+  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  InputHandlerManagerClient* const client_;
+  // May be null.
+  InputHandlerManagerSyncHandlerProxyClient* const
+      synchronous_handler_proxy_client_;
+  scheduler::RendererScheduler* const renderer_scheduler_;  // Not owned.
 };
 
 }  // namespace content