Move synthetic gesture input to be aligned with BeginFrame.

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 #include <stdint.h>
@@ skipping 397 matching lines @@
       render_widget_host_->GetRoutingID(), compositor_frame_sink_id,
       is_swap_ack, resources));
 }
 
 void RenderWidgetHostViewMac::BrowserCompositorMacOnLostCompositorResources() {
   render_widget_host_->ScheduleComposite();
 }
 
 void RenderWidgetHostViewMac::BrowserCompositorMacSendBeginFrame(
     const cc::BeginFrameArgs& args) {
+  needs_flush_input_ = false;
+  render_widget_host_->FlushInput();
+  UpdateNeedsBeginFramesInternal();
   render_widget_host_->Send(
       new ViewMsg_BeginFrame(render_widget_host_->GetRoutingID(), args));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // AcceleratedWidgetMacNSView, public:
 
 NSView* RenderWidgetHostViewMac::AcceleratedWidgetGetNSView() const {
   return cocoa_view_;
 }
@@ skipping 16 matching lines @@
 // RenderWidgetHostViewMac, public:
 
 RenderWidgetHostViewMac::RenderWidgetHostViewMac(RenderWidgetHost* widget,
                                                  bool is_guest_view_hack)
     : render_widget_host_(RenderWidgetHostImpl::From(widget)),
       page_at_minimum_scale_(true),
       is_loading_(false),
       allow_pause_for_resize_or_repaint_(true),
       is_guest_view_hack_(is_guest_view_hack),
       fullscreen_parent_host_view_(nullptr),
+      needs_begin_frames_(false),
+      needs_flush_input_(false),
       weak_factory_(this) {
   // |cocoa_view_| owns us and we will be deleted when |cocoa_view_|
   // goes away.  Since we autorelease it, our caller must put
   // |GetNativeView()| into the view hierarchy right after calling us.
   cocoa_view_ = [[[RenderWidgetHostViewCocoa alloc]
                   initWithRenderWidgetHostViewMac:this] autorelease];
 
   // Paint this view host with |background_color_| when there is no content
   // ready to draw.
   background_layer_.reset([[CALayer alloc] init]);
@@ skipping 717 matching lines @@
   if (render_widget_host_)
     render_widget_host_->ForwardMouseEvent(event);
 
   if (event.type == WebInputEvent::MouseLeave) {
     [cocoa_view_ setToolTipAtMousePoint:nil];
     tooltip_text_.clear();
   }
 }
 
 void RenderWidgetHostViewMac::SetNeedsBeginFrames(bool needs_begin_frames) {
-  browser_compositor_->SetNeedsBeginFrames(needs_begin_frames);
+  needs_begin_frames_ = needs_begin_frames;
+  UpdateNeedsBeginFramesInternal();
+}
+
+void RenderWidgetHostViewMac::OnSetNeedsFlushInput() {
+  needs_flush_input_ = true;
+  UpdateNeedsBeginFramesInternal();
+}
+
+void RenderWidgetHostViewMac::UpdateNeedsBeginFramesInternal() {
+  browser_compositor_->SetNeedsBeginFrames(needs_begin_frames_ ||
+                                           needs_flush_input_);
 }
 
 void RenderWidgetHostViewMac::KillSelf() {
   if (!weak_factory_.HasWeakPtrs()) {
     [cocoa_view_ setHidden:YES];
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(&RenderWidgetHostViewMac::ShutdownHost,
                               weak_factory_.GetWeakPtr()));
   }
 }
@@ skipping 2171 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end