Dynamically set CAOpenGLLAyer to be asynchronous

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 390 matching lines @@
 ///////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewMac, public:
 
 RenderWidgetHostViewMac::RenderWidgetHostViewMac(RenderWidgetHost* widget)
     : render_widget_host_(RenderWidgetHostImpl::From(widget)),
       about_to_validate_and_paint_(false),
       call_set_needs_display_in_rect_pending_(false),
       last_frame_was_accelerated_(false),
       text_input_type_(ui::TEXT_INPUT_TYPE_NONE),
       can_compose_inline_(true),
+      compositing_iosurface_layer_async_timer_(
+            FROM_HERE, base::TimeDelta::FromMilliseconds(200),

[Avi (use Gerrit), 2014/02/14 02:11:29]

... you say 200ms here.

[ccameron, 2014/02/14 02:32:19]

Changed to 250

+            this, &RenderWidgetHostViewMac::TimerSinceGotAcceleratedFrameFired),
       allow_overlapping_views_(false),
       use_core_animation_(false),
       pending_latency_info_delay_(0),
       pending_latency_info_delay_weak_ptr_factory_(this),
       is_loading_(false),
       weak_factory_(this),
       fullscreen_parent_host_view_(NULL),
       underlay_view_has_drawn_(false),
       overlay_view_weak_factory_(this),
       software_frame_weak_ptr_factory_(this) {
@@ skipping 977 matching lines @@
     // setNeedsDisplay will never display and we'll never ack if the window is
     // empty, so ack now and don't bother calling setNeedsDisplay below.
     return;
   }
 
   // No need to draw the surface if we are inside a drawRect. It will be done
   // later.
   if (!about_to_validate_and_paint_) {
     if (use_core_animation_) {
       DCHECK(compositing_iosurface_layer_);
-      [compositing_iosurface_layer_ setNeedsDisplay];
+      compositing_iosurface_layer_async_timer_.Reset();
+      [compositing_iosurface_layer_ gotNewFrame];
     } else {
       if (!DrawIOSurfaceWithoutCoreAnimation()) {
         [cocoa_view_ setNeedsDisplay:YES];
         GotAcceleratedCompositingError();
         return;
       }
     }
   }
 }
 
@@ skipping 477 matching lines @@
     // http://crbug.com/279472
     if (!use_core_animation_)
       [[cocoa_view_ window] disableScreenUpdatesUntilFlush];
     if (allow_overlapping_views_)
       DestroyCompositedIOSurfaceAndLayer(kLeaveContextBoundToView);
     else
       DestroyCompositedIOSurfaceAndLayer(kDestroyContext);
   }
 }
 
+void RenderWidgetHostViewMac::TimerSinceGotAcceleratedFrameFired() {
+  [compositing_iosurface_layer_ timerSinceGotNewFrameFired];
+}
+
 void RenderWidgetHostViewMac::SetActive(bool active) {
   if (render_widget_host_) {
     render_widget_host_->SetActive(active);
     if (active) {
       if (HasFocus())
         render_widget_host_->Focus();
     } else {
       render_widget_host_->Blur();
     }
   }
@@ skipping 2177 matching lines @@
   return YES;
 }
 
 - (BOOL)isOpaque {
   if (renderWidgetHostView_->use_core_animation_)
     return YES;
   return [super isOpaque];
 }
 
 @end