input: Change how synthesized events are dispatched in telemetry tests.

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index 0a5c0dbb3b980e40790a9b73d530ebbd02a71ce1..959a322ef1df1f217bb72198d7d6b9e11b98b299 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -477,11 +477,7 @@ class CONTENT_EXPORT RenderWidgetHostImpl
   // Update the renderer's cache of the screen rect of the view and window.
   void SendScreenRects();
 
-  // Called by the view in response to a flush request.
-  void FlushInput();
-
-  // Request a flush signal from the view.
-  void SetNeedsFlush();
+  void OnBeginFrame();
 
   // Indicates whether the renderer drives the RenderWidgetHosts's size or the
   // other way around.
@@ -641,6 +637,9 @@ class CONTENT_EXPORT RenderWidgetHostImpl
 
   void OnGpuSwapBuffersCompletedInternal(const ui::LatencyInfo& latency_info);
 
+  void RequestBeginFrameForSynthesizedInput(
+      base::OnceClosure begin_frame_callback);
+
   // IPC message handlers
   void OnRenderProcessGone(int status, int error_code);
   void OnClose();
@@ -983,6 +982,8 @@ class CONTENT_EXPORT RenderWidgetHostImpl
   // Sorted by frame token.
   std::queue<std::pair<uint32_t, std::vector<IPC::Message>>> queued_messages_;
 
+  base::OnceClosure begin_frame_callback_;
+
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);