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 211 matching lines @@
 
 LayerTreeHostImpl::LayerTreeHostImpl(
     const LayerTreeSettings& settings,
     LayerTreeHostImplClient* client,
     Proxy* proxy,
     RenderingStatsInstrumentation* rendering_stats_instrumentation,
     SharedBitmapManager* manager,
     int id)
     : client_(client),
       proxy_(proxy),
+      needs_begin_frames_(false),
       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),
       settings_(settings),
@@ skipping 1180 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);
+  CallOnBeginFrame(args);
 }
 
 void LayerTreeHostImpl::DidSwapBuffers() {
   client_->DidSwapBuffersOnImplThread();
 }
 
 void LayerTreeHostImpl::DidSwapBuffersComplete() {
   client_->DidSwapBuffersCompleteOnImplThread();
 }
 
@@ skipping 219 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) {
+bool LayerTreeHostImpl::NeedsBeginFrames() const {
+  return needs_begin_frames_;
+}
+
+void LayerTreeHostImpl::SetNeedsBeginFrames(bool enable) {
+  needs_begin_frames_ = enable;
   if (output_surface_)
     output_surface_->SetNeedsBeginFrame(enable);
   else
     DCHECK(!enable);
 }
 
 void LayerTreeHostImpl::WillBeginImplFrame(const BeginFrameArgs& args) {
   // Sample the frame time now. This time will be used for updating animations
   // when we draw.
   UpdateCurrentBeginFrameArgs(args);
@@ skipping 1457 matching lines @@
   // Try to use the current frame time to keep animations non-jittery.  But if
   // we're not in a frame (because this is during an input event or a delayed
   // task), fall back to physical time.  This should still be monotonic.
   if (current_begin_frame_args_.IsValid())
     return current_begin_frame_args_;
   return BeginFrameArgs::Create(gfx::FrameTime::Now(),
                                 base::TimeTicks(),
                                 BeginFrameArgs::DefaultInterval());
 }
 
+void LayerTreeHostImpl::AsValueInto(base::debug::TracedValue* value) const {
+  return AsValueWithFrameInto(NULL, value);
+}
+
 scoped_refptr<base::debug::ConvertableToTraceFormat>
 LayerTreeHostImpl::AsValue() const {
   return AsValueWithFrame(NULL);
 }
 
 scoped_refptr<base::debug::ConvertableToTraceFormat>
 LayerTreeHostImpl::AsValueWithFrame(FrameData* frame) const {
   scoped_refptr<base::debug::TracedValue> state =
       new base::debug::TracedValue();
   AsValueWithFrameInto(frame, state.get());
@@ skipping 218 matching lines @@
 }
 
 void LayerTreeHostImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
   std::vector<PictureLayerImpl*>::iterator it =
       std::find(picture_layers_.begin(), picture_layers_.end(), layer);
   DCHECK(it != picture_layers_.end());
   picture_layers_.erase(it);
 }
 
 }  // namespace cc