Update from https://crrev.com/303153

cc/resources/picture_pile.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/resources/picture_pile.h"
 
 #include <algorithm>
 #include <limits>
 #include <vector>
 
@@ skipping 520 matching lines @@
     DCHECK(found_tile_for_recorded_picture);
   }
 
   has_any_recordings_ = true;
   DCHECK(CanRasterSlowTileCheck(recorded_viewport_));
   return true;
 }
 
 void PicturePile::SetEmptyBounds() {
   tiling_.SetTilingSize(gfx::Size());
-  picture_map_.clear();
-  has_any_recordings_ = false;
-  recorded_viewport_ = gfx::Rect();
+  Clear();
 }
 
 void PicturePile::DetermineIfSolidColor() {
   is_solid_color_ = false;
   solid_color_ = SK_ColorTRANSPARENT;
 
   if (picture_map_.empty()) {
     return;
   }
 
@@ skipping 15 matching lines @@
       return;
   }
   skia::AnalysisCanvas canvas(recorded_viewport_.width(),
                               recorded_viewport_.height());
   canvas.translate(-recorded_viewport_.x(), -recorded_viewport_.y());
   picture->Raster(&canvas, nullptr, Region(), 1.0f);
   is_solid_color_ = canvas.GetColorIfSolid(&solid_color_);
 }
 
 }  // namespace cc