cc: Remove unused should_update_tile_priorities.

cc/layers/picture_layer_impl.cc

 // Copyright 2012 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/picture_layer_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <set>
@@ skipping 64 matching lines @@
       ideal_device_scale_(0.f),
       ideal_source_scale_(0.f),
       ideal_contents_scale_(0.f),
       raster_page_scale_(0.f),
       raster_device_scale_(0.f),
       raster_source_scale_(0.f),
       raster_contents_scale_(0.f),
       low_res_raster_contents_scale_(0.f),
       raster_source_scale_is_fixed_(false),
       was_screen_space_transform_animating_(false),
-      should_update_tile_priorities_(false),
       only_used_low_res_last_append_quads_(false),
       is_mask_(is_mask),
       nearest_neighbor_(false) {
   layer_tree_impl()->RegisterPictureLayerImpl(this);
 }
 
 PictureLayerImpl::~PictureLayerImpl() {
   if (twin_layer_)
     twin_layer_->twin_layer_ = nullptr;
   layer_tree_impl()->UnregisterPictureLayerImpl(this);
@@ skipping 359 matching lines @@
   DCHECK(raster_source_scale_);
   DCHECK(raster_contents_scale_);
   DCHECK(low_res_raster_contents_scale_);
 
   was_screen_space_transform_animating_ =
       draw_properties().screen_space_transform_is_animating;
 
   if (draw_transform_is_animating())
     raster_source_->SetShouldAttemptToUseDistanceFieldText();
 
-  should_update_tile_priorities_ = true;
-
   return UpdateTilePriorities(occlusion_in_content_space);
 }
 
 bool PictureLayerImpl::UpdateTilePriorities(
     const Occlusion& occlusion_in_content_space) {
   DCHECK_IMPLIES(raster_source_->IsSolidColor(), tilings_->num_tilings() == 0);
 
   double current_frame_time_in_seconds =
       (layer_tree_impl()->CurrentBeginFrameArgs().frame_time -
        base::TimeTicks()).InSecondsF();
@@ skipping 592 matching lines @@
   return nextafterf(max_scale, 0.f);
 }
 
 void PictureLayerImpl::ResetRasterScale() {
   raster_page_scale_ = 0.f;
   raster_device_scale_ = 0.f;
   raster_source_scale_ = 0.f;
   raster_contents_scale_ = 0.f;
   low_res_raster_contents_scale_ = 0.f;
   raster_source_scale_is_fixed_ = false;
-
-  // When raster scales aren't valid, don't update tile priorities until
-  // this layer has been updated via UpdateDrawProperties.
-  should_update_tile_priorities_ = false;
 }
 
 bool PictureLayerImpl::CanHaveTilings() const {
   if (raster_source_->IsSolidColor())
     return false;
   if (!DrawsContent())
     return false;
   if (!raster_source_->HasRecordings())
     return false;
   // If the |raster_source_| has a recording it should have non-empty bounds.
@@ skipping 193 matching lines @@
 
 bool PictureLayerImpl::AllTilesRequiredForDrawAreReadyToDraw() const {
   if (!layer_tree_impl()->IsActiveTree())
     return true;
 
   return AllTilesRequiredAreReadyToDraw(
       &PictureLayerTiling::IsTileRequiredForDrawIfVisible);
 }
 
 }  // namespace cc