cc: Handle retroactive BeginFrames in the Scheduler.

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 1257 matching lines @@
   device_viewport_valid_for_tile_management_ = valid_for_tile_management;
 }
 
 void LayerTreeHostImpl::SetNeedsRedrawRect(const gfx::Rect& damage_rect) {
   if (damage_rect.IsEmpty())
     return;
   NotifySwapPromiseMonitorsOfSetNeedsRedraw();
   client_->SetNeedsRedrawRectOnImplThread(damage_rect);
 }
 
-void LayerTreeHostImpl::BeginImplFrame(const BeginFrameArgs& args) {
-  client_->BeginImplFrame(args);
+void LayerTreeHostImpl::BeginFrame(const BeginFrameArgs& args) {
+  client_->BeginFrame(args);
 }
 
 void LayerTreeHostImpl::DidSwapBuffers() {
   client_->DidSwapBuffersOnImplThread();
 }
 
 void LayerTreeHostImpl::OnSwapBuffersComplete() {
   client_->OnSwapBuffersCompleteOnImplThread();
 }
 
@@ skipping 180 matching lines @@
     TRACE_EVENT_FLOW_STEP0(
         "input",
         "LatencyInfo.Flow",
         TRACE_ID_DONT_MANGLE(metadata.latency_info[i].trace_id),
         "SwapBuffers");
   }
   renderer_->SwapBuffers(metadata);
   return true;
 }
 
-void LayerTreeHostImpl::SetNeedsBeginImplFrame(bool enable) {
+void LayerTreeHostImpl::SetNeedsBeginFrame(bool enable) {
   if (output_surface_)
-    output_surface_->SetNeedsBeginImplFrame(enable);
+    output_surface_->SetNeedsBeginFrame(enable);
+}
+
+void LayerTreeHostImpl::WillBeginImplFrame(const BeginFrameArgs& args) {
+  // Sample the frame time now. This time will be used for updating animations
+  // when we draw.

[Sami, 2014/04/03 15:55:58]

Neat!

+  UpdateCurrentFrameTime();
 }
 
 gfx::SizeF LayerTreeHostImpl::ComputeInnerViewportContainerSize() const {
   gfx::SizeF dip_size =
       gfx::ScaleSize(device_viewport_size_, 1.f / device_scale_factor());
 
   float top_offset =
       top_controls_manager_ ? top_controls_manager_->content_top_offset() : 0.f;
 
   return gfx::SizeF(dip_size.width(),
@@ skipping 340 matching lines @@
     return false;
 
   if (settings_.impl_side_painting) {
     CreateAndSetTileManager(
         resource_provider.get(),
         output_surface->context_provider().get(),
         GetRendererCapabilities().using_map_image,
         GetRendererCapabilities().allow_rasterize_on_demand);
   }
 
-  // Setup BeginImplFrameEmulation if it's not supported natively
+  // Setup BeginFrameEmulation if it's not supported natively
   if (!settings_.begin_impl_frame_scheduling_enabled) {
     const base::TimeDelta display_refresh_interval =
       base::TimeDelta::FromMicroseconds(
           base::Time::kMicrosecondsPerSecond /
           settings_.refresh_rate);
 
-    output_surface->InitializeBeginImplFrameEmulation(
+    output_surface->InitializeBeginFrameEmulation(
         proxy_->ImplThreadTaskRunner(),
         settings_.throttle_frame_production,
         display_refresh_interval);
   }
 
   int max_frames_pending =
       output_surface->capabilities().max_frames_pending;
   if (max_frames_pending <= 0)
     max_frames_pending = OutputSurface::DEFAULT_MAX_FRAMES_PENDING;
   output_surface->SetMaxFramesPending(max_frames_pending);
@@ skipping 1179 matching lines @@
   swap_promise_monitor_.erase(monitor);
 }
 
 void LayerTreeHostImpl::NotifySwapPromiseMonitorsOfSetNeedsRedraw() {
   std::set<SwapPromiseMonitor*>::iterator it = swap_promise_monitor_.begin();
   for (; it != swap_promise_monitor_.end(); it++)
     (*it)->OnSetNeedsRedrawOnImpl();
 }
 
 }  // namespace cc