Support InputRouter recycling

content/browser/renderer_host/input/input_router.h

Index: content/browser/renderer_host/input/input_router.h
diff --git a/content/browser/renderer_host/input/input_router.h b/content/browser/renderer_host/input/input_router.h
index 1b30815c7ce2a781001d6273c50cd3a0575ef52b..b5eb9e159bce629020bee6d7bd792550e00da857 100644
--- a/content/browser/renderer_host/input/input_router.h
+++ b/content/browser/renderer_host/input/input_router.h
@@ -24,10 +24,6 @@ class InputRouter : public IPC::Listener {
  public:
   virtual ~InputRouter() {}
 
-  // Should be called only in response to |SetNeedsFlush| requests made via
-  // the |InputRouterClient|.
-  virtual void Flush() = 0;
-
   // Send and take ownership of the the given InputMsg_*. This should be used
   // only for event types not associated with a WebInputEvent.  Returns true on
   // success and false otherwise.
@@ -47,6 +43,17 @@ class InputRouter : public IPC::Listener {
   virtual void SendTouchEvent(
       const TouchEventWithLatencyInfo& touch_event) = 0;
 
+  // Recycle the router for use with a new event stream, resetting all
+  // pending/queued events from the router. Event types that require in-order
+  // acks (touch events) will be provided them.
+  virtual void Recycle() = 0;
+
+  // Request a notification from the router (through its client) when it becomes
+  // empty after dispatching all current and pending events. Note that this is
+  // not a strict flush marker, as the router will wait until *all* input has
+  // been dispatched, potentially including future input.
+  virtual void RequestFlushedNotification() = 0;
+
   // Returns the oldest queued or in-flight keyboard event sent to the router.
   virtual const NativeWebKeyboardEvent* GetLastKeyboardEvent() const = 0;