Make PageScaleFactor work for oopif subframes.

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 <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1239 matching lines @@
 void PictureLayerImpl::UpdateIdealScales() {
   DCHECK(CanHaveTilings());
 
   float min_contents_scale = MinimumContentsScale();
   DCHECK_GT(min_contents_scale, 0.f);
 
   ideal_page_scale_ = IsAffectedByPageScale()
                           ? layer_tree_impl()->current_page_scale_factor()
                           : 1.f;
   ideal_device_scale_ = layer_tree_impl()->device_scale_factor();
+  ideal_contents_scale_ = GetIdealContentsScale();
+  if (!layer_tree_impl()->PageScaleLayer()) {
+    float subframe_page_scale_factor =
+        layer_tree_impl()->GetSubframePageScaleFactor();
+    ideal_page_scale_ = subframe_page_scale_factor;
+    ideal_contents_scale_ *= subframe_page_scale_factor;
+  }
   ideal_contents_scale_ =
       std::min(kMaxIdealContentsScale,
-               std::max(GetIdealContentsScale(), min_contents_scale));
+               std::max(ideal_contents_scale_, min_contents_scale));
   ideal_source_scale_ =
       ideal_contents_scale_ / ideal_page_scale_ / ideal_device_scale_;
   UMA_HISTOGRAM_CUSTOM_COUNTS("Renderer4.IdealContentsScale",
                               ideal_contents_scale_, 1, 10000, 50);
 }
 
 void PictureLayerImpl::GetDebugBorderProperties(
     SkColor* color,
     float* width) const {
   if (is_directly_composited_image_) {
@@ skipping 92 matching lines @@
 bool PictureLayerImpl::IsOnActiveOrPendingTree() const {
   return !layer_tree_impl()->IsRecycleTree();
 }
 
 bool PictureLayerImpl::HasValidTilePriorities() const {
   return IsOnActiveOrPendingTree() &&
          is_drawn_render_surface_layer_list_member();
 }
 
 }  // namespace cc