Add hooks for flushing input from BeginFrame dispatch on Aura

content/browser/renderer_host/input/input_router_impl.h

Index: content/browser/renderer_host/input/input_router_impl.h
diff --git a/content/browser/renderer_host/input/input_router_impl.h b/content/browser/renderer_host/input/input_router_impl.h
index e1ea09a149b39b226d5c2d9e4164486180950f21..189d93ddd047fa2aa730ab2647ea2d952969c9ae 100644
--- a/content/browser/renderer_host/input/input_router_impl.h
+++ b/content/browser/renderer_host/input/input_router_impl.h
@@ -9,6 +9,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"

[tdresser, 2015/10/23 12:32:07]

Is this used?

[jdduke (slow), 2015/10/23 18:00:39]

Woops, bad rebase here I think... Removed.

 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/gesture_event_queue.h"
 #include "content/browser/renderer_host/input/input_router.h"
@@ -56,6 +57,7 @@ class CONTENT_EXPORT InputRouterImpl
 
   // InputRouter
   bool SendInput(scoped_ptr<IPC::Message> message) override;
+  void FlushInput(base::TimeTicks flush_time) override;
   void SendMouseEvent(const MouseEventWithLatencyInfo& mouse_event) override;
   void SendWheelEvent(
       const MouseWheelEventWithLatencyInfo& wheel_event) override;
@@ -66,7 +68,6 @@ class CONTENT_EXPORT InputRouterImpl
   void SendTouchEvent(const TouchEventWithLatencyInfo& touch_event) override;
   const NativeWebKeyboardEvent* GetLastKeyboardEvent() const override;
   void NotifySiteIsMobileOptimized(bool is_mobile_optimized) override;
-  void RequestNotificationWhenFlushed() override;
   bool HasPendingEvents() const override;
 
   // IPC::Listener
@@ -173,7 +174,7 @@ private:
   // non-zero touch timeout configuration.
   void UpdateTouchAckTimeoutEnabled();
 
-  // If a flush has been requested, signals a completed flush to the client if
+  // If a flush call has been made, signals a completed flush to the client if
   // all events have been dispatched (i.e., |HasPendingEvents()| is false).
   void SignalFlushedIfNecessary();
 
@@ -236,8 +237,8 @@ private:
   // Defaults to ACK_SOURCE_NONE.
   AckSource current_ack_source_;
 
-  // Whether a call to |Flush()| has yet been accompanied by a |DidFlush()| call
-  // to the client_ after all events have been dispatched/acked.
+  // Whether a |FlushInput()| call has yet been accompanied by a
+  // |DidFlushAllInput()| call to the client.

[tdresser, 2015/10/23 12:32:07]

This leaves the case where we haven't received a |FlushInput()| call at all
ambiguous.

Can we reword to something like, 

Whether we've received a |FlushInput()| call without yet calling
|DidFlashAllInput()| on the client.

[jdduke (slow), 2015/10/23 18:00:39]

Done.

   bool flush_requested_;
 
   // Whether there are any active flings in the renderer. As the fling