Support InputRouter recycling

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index f152c57916ac229b736484ec5016bb1406c4f327..ff88b56e6c230abba68e9e77398cc80176b6992c 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -187,7 +187,6 @@ RenderWidgetHostImpl::RenderWidgetHostImpl(RenderWidgetHostDelegate* delegate,
       suppress_next_char_events_(false),
       pending_mouse_lock_request_(false),
       allow_privileged_mouse_lock_(false),
-      has_touch_handler_(false),
       last_input_number_(static_cast<int64>(GetProcess()->GetID()) << 32),
       next_browser_snapshot_id_(1),
       browser_composite_latency_history_(kBrowserCompositeLatencyHistorySize),
@@ -393,7 +392,7 @@ void RenderWidgetHostImpl::SuppressNextCharEvents() {
 }
 
 void RenderWidgetHostImpl::FlushInput() {
-  input_router_->Flush();
+  input_router_->RequestFlushedNotification();
   if (synthetic_gesture_controller_)
     synthetic_gesture_controller_->Flush(base::TimeTicks::Now());
 }
@@ -1855,15 +1854,9 @@ void RenderWidgetHostImpl::DecrementInFlightEventCount() {
   }
 }
 
-void RenderWidgetHostImpl::OnHasTouchEventHandlers(bool has_handlers) {
-  has_touch_handler_ = has_handlers;
-}
-
 void RenderWidgetHostImpl::DidFlush() {
   if (synthetic_gesture_controller_)
     synthetic_gesture_controller_->OnDidFlushInput();
-  if (view_)
-    view_->OnDidFlushInput();
 }
 
 void RenderWidgetHostImpl::DidOverscroll(const DidOverscrollParams& params) {