Read compositor VSync information from platform, when possible

ui/compositor/compositor.cc

 // 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 "ui/compositor/compositor.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/memory/singleton.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/run_loop.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "cc/base/latency_info_swap_promise.h"
 #include "cc/base/switches.h"
 #include "cc/input/input_handler.h"
 #include "cc/layers/layer.h"
 #include "cc/output/context_provider.h"
 #include "cc/trees/layer_tree_host.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/compositor_switches.h"
+#include "ui/compositor/compositor_vsync_manager.h"
 #include "ui/compositor/dip_util.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/frame_time.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_switches.h"
 
 namespace {
 
 const double kDefaultRefreshRate = 60.0;
 const double kTestRefreshRate = 200.0;
@@ skipping 136 matching lines @@
   posted_swaps_->pending_swap_ = NULL;
 }
 
 }  // namespace
 
 namespace ui {
 
 Compositor::Compositor(gfx::AcceleratedWidget widget)
     : root_layer_(NULL),
       widget_(widget),
+      vsync_manager_(new CompositorVSyncManager()),
       posted_swaps_(new PostedSwapQueue()),
       device_scale_factor_(0.0f),
       last_started_frame_(0),
       last_ended_frame_(0),
       next_draw_is_resize_(false),
       disable_schedule_composite_(false),
       compositor_lock_(NULL),
       defer_draw_scheduling_(false),
       waiting_on_compositing_end_(false),
       draw_on_compositing_end_(false),
@@ skipping 217 matching lines @@
     if (root_layer_)
       root_layer_->OnDeviceScaleFactorChanged(scale);
   }
 }
 
 void Compositor::SetBackgroundColor(SkColor color) {
   host_->set_background_color(color);
   ScheduleDraw();
 }
 
+scoped_refptr<CompositorVSyncManager> Compositor::vsync_manager() const {
+  return vsync_manager_;
+}
+
 void Compositor::AddObserver(CompositorObserver* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void Compositor::RemoveObserver(CompositorObserver* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
 bool Compositor::HasObserver(CompositorObserver* observer) {
   return observer_list_.HasObserver(observer);
 }
 
-void Compositor::OnUpdateVSyncParameters(base::TimeTicks timebase,
-                                         base::TimeDelta interval) {
-  FOR_EACH_OBSERVER(CompositorObserver,
-                    observer_list_,
-                    OnUpdateVSyncParameters(this, timebase, interval));
-}
-
 void Compositor::Layout() {
   // We're sending damage that will be addressed during this composite
   // cycle, so we don't need to schedule another composite to address it.
   disable_schedule_composite_ = true;
   if (root_layer_)
     root_layer_->SendDamagedRects();
   disable_schedule_composite_ = false;
 }
 
 scoped_ptr<cc::OutputSurface> Compositor::CreateOutputSurface(bool fallback) {
@@ skipping 108 matching lines @@
     // CompositorObservers to be notified before starting another
     // draw cycle.
     ScheduleDraw();
   }
   FOR_EACH_OBSERVER(CompositorObserver,
                     observer_list_,
                     OnCompositingEnded(this));
 }
 
 }  // namespace ui