Refactoring the way begin frame sources inside scheduler work.

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 195 matching lines @@
       settings, client, proxy, rendering_stats_instrumentation, manager, id));
 }
 
 LayerTreeHostImpl::LayerTreeHostImpl(
     const LayerTreeSettings& settings,
     LayerTreeHostImplClient* client,
     Proxy* proxy,
     RenderingStatsInstrumentation* rendering_stats_instrumentation,
     SharedBitmapManager* manager,
     int id)
-    : client_(client),
+    : BaseBeginFrameSource(0),
+      client_(client),
       proxy_(proxy),
       use_gpu_rasterization_(false),
       input_handler_client_(NULL),
       did_lock_scrolling_layer_(false),
       should_bubble_scrolls_(false),
       wheel_scrolling_(false),
       scroll_affects_scroll_handler_(false),
       scroll_layer_id_when_mouse_over_scrollbar_(0),
       tile_priorities_dirty_(false),
       root_layer_scroll_offset_delegate_(NULL),
@@ skipping 1095 matching lines @@
 }
 
 void LayerTreeHostImpl::SetNeedsRedrawRect(const gfx::Rect& damage_rect) {
   if (damage_rect.IsEmpty())
     return;
   NotifySwapPromiseMonitorsOfSetNeedsRedraw();
   client_->SetNeedsRedrawRectOnImplThread(damage_rect);
 }
 
 void LayerTreeHostImpl::BeginFrame(const BeginFrameArgs& args) {
-  client_->BeginFrame(args);
+  frame_sink_->BeginFrame(args);
 }
 
 void LayerTreeHostImpl::DidSwapBuffers() {
   client_->DidSwapBuffersOnImplThread();
 }
 
 void LayerTreeHostImpl::DidSwapBuffersComplete() {
   client_->DidSwapBuffersCompleteOnImplThread();
 }
 
@@ skipping 214 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::SetNeedsBeginFrame(bool enable) {
+void LayerTreeHostImpl::OnGenerateChange(bool generate_frames) {
   if (output_surface_)
-    output_surface_->SetNeedsBeginFrame(enable);
+    output_surface_->SetNeedsBeginFrame(generate_frames);
   else
-    DCHECK(!enable);
+    DCHECK(!generate_frames);
+}
+
+std::string LayerTreeHostImpl::TypeString() const {
+  return "LayerTreeHostImpl";
 }
 
 void LayerTreeHostImpl::WillBeginImplFrame(const BeginFrameArgs& args) {
   // Sample the frame time now. This time will be used for updating animations
   // when we draw.
   UpdateCurrentFrameTime();
   // Cache the begin impl frame interval
   begin_impl_frame_interval_ = args.interval;
 }
 
@@ skipping 1547 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