[animations] Adds metrics for jank on selected layer animations

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 <stddef.h>
 
 #include <algorithm>
 #include <deque>
@@ skipping 62 matching lines @@
 }
 
 Compositor::Compositor(const cc::FrameSinkId& frame_sink_id,
                        ui::ContextFactory* context_factory,
                        ui::ContextFactoryPrivate* context_factory_private,
                        scoped_refptr<base::SingleThreadTaskRunner> task_runner)
     : context_factory_(context_factory),
       context_factory_private_(context_factory_private),
       root_layer_(NULL),
       widget_(gfx::kNullAcceleratedWidget),
+      committed_frame_number_(0),
       widget_valid_(false),
       compositor_frame_sink_requested_(false),
       frame_sink_id_(frame_sink_id),
       task_runner_(task_runner),
       vsync_manager_(new CompositorVSyncManager()),
       device_scale_factor_(0.0f),
       locks_will_time_out_(true),
       compositor_lock_(NULL),
       layer_animator_collection_(this),
       weak_ptr_factory_(this) {
   if (context_factory_private) {
     context_factory_private->GetSurfaceManager()->RegisterFrameSinkId(
         frame_sink_id_);
   }
   root_web_layer_ = cc::Layer::Create();
 
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 
   cc::LayerTreeSettings settings;
 
   // This will ensure PictureLayers always can have LCD text, to match the
   // previous behaviour with ContentLayers, where LCD-not-allowed notifications
   // were ignored.
   settings.layers_always_allowed_lcd_text = true;
   // Use occlusion to allow more overlapping windows to take less memory.
   settings.use_occlusion_for_tile_prioritization = true;
-  settings.renderer_settings.refresh_rate =
+  refresh_rate_ = settings.renderer_settings.refresh_rate =
       context_factory_->DoesCreateTestContexts() ? kTestRefreshRate
                                                  : kDefaultRefreshRate;
   settings.main_frame_before_activation_enabled = false;
   if (command_line->HasSwitch(switches::kDisableGpuVsync)) {
     std::string display_vsync_string =
         command_line->GetSwitchValueASCII(switches::kDisableGpuVsync);
     // See comments in gl_switches about this flag.  The browser compositor
     // is only unthrottled when "gpu" or no switch value is passed, as it
     // is driven directly by the display compositor.
     if (display_vsync_string != "beginframe") {
@@ skipping 262 matching lines @@
   return host_->GetInputHandler()->ScrollLayerTo(layer_id, offset);
 }
 
 bool Compositor::GetScrollOffsetForLayer(int layer_id,
                                          gfx::ScrollOffset* offset) const {
   return host_->GetInputHandler()->GetScrollOffsetForLayer(layer_id, offset);
 }
 
 void Compositor::SetAuthoritativeVSyncInterval(
     const base::TimeDelta& interval) {
+  DCHECK_GT(interval.InMillisecondsF(), 0);
+  refresh_rate_ =
+      base::Time::kMillisecondsPerSecond / interval.InMillisecondsF();
   if (context_factory_private_)
     context_factory_private_->SetAuthoritativeVSyncInterval(this, interval);
   vsync_manager_->SetAuthoritativeVSyncInterval(interval);
 }
 
 void Compositor::SetDisplayVSyncParameters(base::TimeTicks timebase,
                                            base::TimeDelta interval) {
   if (interval.is_zero()) {
     // TODO(brianderson): We should not be receiving 0 intervals.
     interval = cc::BeginFrameArgs::DefaultInterval();
   }
+  DCHECK_GT(interval.InMillisecondsF(), 0);
+  refresh_rate_ =
+      base::Time::kMillisecondsPerSecond / interval.InMillisecondsF();
 
   if (context_factory_private_) {
     context_factory_private_->SetDisplayVSyncParameters(this, timebase,
                                                         interval);
   }
   vsync_manager_->UpdateVSyncParameters(timebase, interval);
 }
 
 void Compositor::SetAcceleratedWidget(gfx::AcceleratedWidget widget) {
   // This function should only get called once.
@@ skipping 86 matching lines @@
   NOTREACHED();
 }
 
 void Compositor::DidCommit() {
   DCHECK(!IsLocked());
   for (auto& observer : observer_list_)
     observer.OnCompositingDidCommit(this);
 }
 
 void Compositor::DidReceiveCompositorFrameAck() {
+  ++committed_frame_number_;
   for (auto& observer : observer_list_)
     observer.OnCompositingEnded(this);
 }
 
 void Compositor::DidSubmitCompositorFrame() {
   base::TimeTicks start_time = base::TimeTicks::Now();
   for (auto& observer : observer_list_)
     observer.OnCompositingStarted(this, start_time);
 }
 
@@ skipping 32 matching lines @@
   for (auto& observer : observer_list_)
     observer.OnCompositingLockStateChanged(this);
 }
 
 void Compositor::CancelCompositorLock() {
   if (compositor_lock_)
     compositor_lock_->CancelLock();
 }
 
 }  // namespace ui