Ack swap buffers after a timeout

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 <QuartzCore/QuartzCore.h>
 
 #include "base/basictypes.h"
@@ skipping 2340 matching lines @@
     SendPendingLatencyInfoToHost();
   }
 }
 
 void RenderWidgetHostViewMac::AddPendingSwapAck(
     int32 route_id, int gpu_host_id, int32 renderer_id) {
   // Note that multiple un-acked swaps can come in the event of a GPU process
   // loss. Drop the old acks.
   pending_swap_ack_.reset(new PendingSwapAck(
       route_id, gpu_host_id, renderer_id));
-
-  // A trace value of 2 indicates that there is a pending swap ack. See
-  // CompositingIOSurfaceLayer's canDrawInCGLContext for other value meanings.
-  TRACE_COUNTER_ID1("browser", "PendingSwapAck",
-                    compositing_iosurface_layer_.get(), 2);
 }
 
 void RenderWidgetHostViewMac::SendPendingSwapAck() {
   if (!pending_swap_ack_)
     return;
 
   AcceleratedSurfaceMsg_BufferPresented_Params ack_params;
   ack_params.sync_point = 0;
   ack_params.renderer_id = pending_swap_ack_->renderer_id;
   RenderWidgetHostImpl::AcknowledgeBufferPresent(pending_swap_ack_->route_id,
                                                  pending_swap_ack_->gpu_host_id,
                                                  ack_params);
   pending_swap_ack_.reset();
-  TRACE_COUNTER_ID1("browser", "PendingSwapAck", this, 0);
 }
 
 void RenderWidgetHostViewMac::PauseForPendingResizeOrRepaintsAndDraw() {
   if (!render_widget_host_ || render_widget_host_->is_hidden())
     return;
 
   // Pausing for the overlay/underlay view prevents the other one from receiving
   // frames. This may lead to large delays, causing overlaps.
   // See crbug.com/352020.
   if (underlay_view_ || overlay_view_)
@@ skipping 89 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // CompositingIOSurfaceLayerClient, public:
 
 void RenderWidgetHostViewMac::AcceleratedLayerDidDrawFrame(bool succeeded) {
   SendPendingLatencyInfoToHost();
   SendPendingSwapAck();
   if (!succeeded)
     GotAcceleratedCompositingError();
 }
 
-bool RenderWidgetHostViewMac::AcceleratedLayerHasNotAckedPendingFrame() const {
-  return pending_swap_ack_;
-}
-
 }  // namespace content
 
 // RenderWidgetHostViewCocoa ---------------------------------------------------
 
 @implementation RenderWidgetHostViewCocoa
 @synthesize selectedRange = selectedRange_;
 @synthesize suppressNextEscapeKeyUp = suppressNextEscapeKeyUp_;
 @synthesize markedRange = markedRange_;
 
 - (id)initWithRenderWidgetHostViewMac:(RenderWidgetHostViewMac*)r {
@@ skipping 1881 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