Fix blurry content after disabling dev tools emulation

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 <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 479 matching lines @@
   property_trees_.UpdateChangeTracking();
   for (auto* layer : *this) {
     if (layer->LayerPropertyChanged())
       layer->NoteLayerPropertyChanged();
     if (layer->render_surface() &&
         layer->render_surface()->AncestorPropertyChanged())
       layer->render_surface()->NoteAncestorPropertyChanged();
   }
 }
 
+void LayerTreeImpl::ForceRecalculateRasterScales() {
+  for (auto* layer : picture_layers_)
+    layer->ResetRasterScale();
+}
+
 LayerImplList::const_iterator LayerTreeImpl::begin() const {
   return layer_list_.cbegin();
 }
 
 LayerImplList::const_iterator LayerTreeImpl::end() const {
   return layer_list_.cend();
 }
 
 LayerImplList::reverse_iterator LayerTreeImpl::rbegin() {
   return layer_list_.rbegin();
@@ skipping 1562 matching lines @@
 
 void LayerTreeImpl::ResetAllChangeTracking() {
   layers_that_should_push_properties_.clear();
   // Iterate over all layers, including masks.
   for (auto& layer : *layers_)
     layer->ResetChangeTracking();
   property_trees_.ResetAllChangeTracking();
 }
 
 }  // namespace cc