Add hooks for flushing input from BeginFrame dispatch on Aura

content/browser/renderer_host/input/input_router_client.h

Index: content/browser/renderer_host/input/input_router_client.h
diff --git a/content/browser/renderer_host/input/input_router_client.h b/content/browser/renderer_host/input/input_router_client.h
index 34fdf0eb9b7783bcbcaea9701dd46a4a71d079e9..51c913b78f750a0b3c152d80f21e45c65606237c 100644
--- a/content/browser/renderer_host/input/input_router_client.h
+++ b/content/browser/renderer_host/input/input_router_client.h
@@ -33,7 +33,7 @@ class CONTENT_EXPORT InputRouterClient {
       const blink::WebInputEvent& input_event,
       const ui::LatencyInfo& latency_info) = 0;
 
-  // Called each time a WebInputEvent IPC is sent.
+  // Called each time a WebInputEvent IPC that expects an ACK is sent.
   virtual void IncrementInFlightEventCount() = 0;
 
   // Called each time a WebInputEvent ACK IPC is received.
@@ -42,10 +42,13 @@ class CONTENT_EXPORT InputRouterClient {
   // Called when the renderer notifies that it has touch event handlers.
   virtual void OnHasTouchEventHandlers(bool has_handlers) = 0;
 
-  // Called when the router has finished flushing all events queued at the time
-  // of the call to Flush.  The call will typically be asynchronous with
-  // respect to the call to |Flush| on the InputRouter.
-  virtual void DidFlush() = 0;
+  // Called when the InputRouter requires a frame-aligned flush signal to
+  // forward pending input.
+  virtual void SetNeedsFlushInput() = 0;
+
+  // Called when the router has finished processing all queued events, both
+  // those awaiting dispatch and those currently in-flight.
+  virtual void DidFlushAllInput() = 0;
 
   // Called when the router has received an overscroll notification from the
   // renderer.