cc: Remove code for drawing checkerboard quads, it's not used.

cc/layers/layer.cc

 // Copyright 2010 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/layers/layer.h"
 
 #include <algorithm>
 
 #include "base/atomic_sequence_num.h"
 #include "base/location.h"
@@ skipping 56 matching lines @@
       is_root_for_isolated_group_(false),
       is_container_for_fixed_position_layers_(false),
       is_drawable_(false),
       draws_content_(false),
       hide_layer_and_subtree_(false),
       masks_to_bounds_(false),
       contents_opaque_(false),
       double_sided_(true),
       should_flatten_transform_(true),
       use_parent_backface_visibility_(false),
-      draw_checkerboard_for_missing_tiles_(false),
       force_render_surface_(false),
       transform_is_invertible_(true),
       has_render_surface_(false),
       scroll_blocks_on_(SCROLL_BLOCKS_ON_NONE),
       background_color_(0),
       opacity_(1.f),
       blend_mode_(SkXfermode::kSrcOver_Mode),
       scroll_parent_(nullptr),
       layer_or_descendant_is_drawn_tracker_(0),
       sorted_for_recursion_tracker_(0),
@@ skipping 908 matching lines @@
 }
 
 void Layer::SetScrollBlocksOn(ScrollBlocksOn scroll_blocks_on) {
   DCHECK(IsPropertyChangeAllowed());
   if (scroll_blocks_on_ == scroll_blocks_on)
     return;
   scroll_blocks_on_ = scroll_blocks_on;
   SetNeedsCommit();
 }
 
-void Layer::SetDrawCheckerboardForMissingTiles(bool checkerboard) {
-  DCHECK(IsPropertyChangeAllowed());
-  if (draw_checkerboard_for_missing_tiles_ == checkerboard)
-    return;
-  draw_checkerboard_for_missing_tiles_ = checkerboard;
-  SetNeedsCommit();
-}
-
 void Layer::SetForceRenderSurface(bool force) {
   DCHECK(IsPropertyChangeAllowed());
   if (force_render_surface_ == force)
     return;
   force_render_surface_ = force;
   SetNeedsCommit();
 }
 
 void Layer::SetDoubleSided(bool double_sided) {
   DCHECK(IsPropertyChangeAllowed());
@@ skipping 165 matching lines @@
                                         : bounds_);
 
   if (frame_viewer_instrumentation::IsTracingLayerTreeSnapshots())
     layer->SetDebugInfo(TakeDebugInfo());
 
   layer->SetTransformTreeIndex(transform_tree_index());
   layer->SetOpacityTreeIndex(opacity_tree_index());
   layer->SetClipTreeIndex(clip_tree_index());
   layer->set_offset_to_transform_parent(offset_to_transform_parent_);
   layer->SetDoubleSided(double_sided_);
-  layer->SetDrawCheckerboardForMissingTiles(
-      draw_checkerboard_for_missing_tiles_);
   layer->SetDrawsContent(DrawsContent());
   layer->SetHideLayerAndSubtree(hide_layer_and_subtree_);
   layer->SetHasRenderSurface(has_render_surface_);
   if (!layer->FilterIsAnimatingOnImplOnly() && !FilterIsAnimating())
     layer->SetFilters(filters_);
   DCHECK(!(FilterIsAnimating() && layer->FilterIsAnimatingOnImplOnly()));
   layer->SetBackgroundFilters(background_filters());
   layer->SetMasksToBounds(masks_to_bounds_);
   layer->SetShouldScrollOnMainThread(should_scroll_on_main_thread_);
   layer->SetHaveWheelEventHandlers(have_wheel_event_handlers_);
@@ skipping 475 matching lines @@
           ? layer_tree_host()->meta_information_sequence_number()
           : 0;
 }
 
 bool Layer::sorted_for_recursion() {
   return sorted_for_recursion_tracker_ ==
          layer_tree_host()->meta_information_sequence_number();
 }
 
 }  // namespace cc