cc: Don't add new tilings while syncing a tiling.

cc/layers/picture_image_layer_impl.cc

 // Copyright 2013 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_image_layer_impl.h"
 
 #include <algorithm>
 
 #include "cc/debug/debug_colors.h"
 #include "cc/trees/layer_tree_impl.h"
@@ skipping 15 matching lines @@
     LayerTreeImpl* tree_impl) {
   return PictureImageLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
 }
 
 void PictureImageLayerImpl::GetDebugBorderProperties(
     SkColor* color, float* width) const {
   *color = DebugColors::ImageLayerBorderColor();
   *width = DebugColors::ImageLayerBorderWidth(layer_tree_impl());
 }
 
-bool PictureImageLayerImpl::ShouldAdjustRasterScale(
-    bool animating_transform_to_screen) const {
+bool PictureImageLayerImpl::ShouldAdjustRasterScale() const {
   return false;
 }
 
-void PictureImageLayerImpl::RecalculateRasterScales(
-    bool animating_transform_to_screen,
-    float maximum_animation_contents_scale) {
-  // Defaults from PictureLayerImpl.
-  PictureLayerImpl::RecalculateRasterScales(animating_transform_to_screen,
-                                            maximum_animation_contents_scale);
-
+void PictureImageLayerImpl::RecalculateRasterScales() {
   // Don't scale images during rastering to ensure image quality, save memory
   // and avoid frequent re-rastering on change of scale.
-  raster_contents_scale_ = std::max(1.f, MinimumContentsScale());
+  raster_page_scale_ = 1.f;
+  raster_device_scale_ = 1.f;
+  raster_source_scale_ = std::max(1.f, MinimumContentsScale());
+  raster_contents_scale_ = raster_source_scale_;
   // We don't need low res tiles.
   low_res_raster_contents_scale_ = raster_contents_scale_;
 }
 
 void PictureImageLayerImpl::UpdateIdealScales() {
   ideal_contents_scale_ = 1.f;
   ideal_page_scale_ = 1.f;
   ideal_device_scale_ = 1.f;
   ideal_source_scale_ = 1.f;
 }
 
 }  // namespace cc