cc: Remove UpdateDrawProperties during sync composite

cc/trees/layer_tree_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_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 
@@ skipping 520 matching lines @@
 void LayerTreeImpl::ClearViewportLayers() {
   page_scale_layer_ = NULL;
   inner_viewport_scroll_layer_ = NULL;
   outer_viewport_scroll_layer_ = NULL;
 }
 
 bool LayerTreeImpl::UpdateDrawProperties(bool update_lcd_text) {
   if (!needs_update_draw_properties_)
     return true;
 
-  // For max_texture_size.
+  // Calling UpdateDrawProperties must clear this flag, so there can be no
+  // early outs before this.
+  needs_update_draw_properties_ = false;
+
+  // For max_texture_size.  When the renderer is re-created in
+  // CreateAndSetRenderer, the needs update draw properties flag is set
+  // agian.

[danakj, 2015/02/19 19:03:30]

again

   if (!layer_tree_host_impl_->renderer())
     return false;
 
+  // Clear this after the renderer early out, as it should still be
+  // possible to hit test even without a renderer.
+  render_surface_layer_list_.clear();
+
   if (!root_layer())
     return false;
 
-  needs_update_draw_properties_ = false;
-  render_surface_layer_list_.clear();
-
   {
     TRACE_EVENT2(
         "cc", "LayerTreeImpl::UpdateDrawProperties::CalculateDrawProperties",
         "IsActive", IsActiveTree(), "SourceFrameNumber", source_frame_number_);
     LayerImpl* page_scale_layer =
         page_scale_layer_ ? page_scale_layer_ : InnerViewportContainerLayer();
     bool can_render_to_separate_surface =
         (layer_tree_host_impl_->GetDrawMode() !=
          DRAW_MODE_RESOURCELESS_SOFTWARE);
 
@@ skipping 1086 matching lines @@
     scoped_ptr<PendingPageScaleAnimation> pending_animation) {
   pending_page_scale_animation_ = pending_animation.Pass();
 }
 
 scoped_ptr<PendingPageScaleAnimation>
     LayerTreeImpl::TakePendingPageScaleAnimation() {
   return pending_page_scale_animation_.Pass();
 }
 
 }  // namespace cc