cc: Add bug number to TODO in PictureLayerImpl::RecalcuateRasterScales

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 <limits>
 #include <set>
 
@@ skipping 1102 matching lines @@
   // the raster_source_scale_ in place.
   if (old_raster_source_scale &&
       !draw_properties().screen_space_transform_is_animating &&
       !was_screen_space_transform_animating_ &&
       old_raster_source_scale != ideal_source_scale_)
     raster_source_scale_is_fixed_ = true;
 
   // TODO(danakj): Adjust raster source scale closer to ideal source scale at
   // a throttled rate. Possibly make use of invalidation_.IsEmpty() on pending
   // tree. This will allow CSS scale changes to get re-rastered at an
-  // appropriate rate.
+  // appropriate rate. (crbug.com/413636)
   if (raster_source_scale_is_fixed_) {
     raster_contents_scale_ /= raster_source_scale_;
     raster_source_scale_ = 1.f;
   }
 
   // During pinch we completely ignore the current ideal scale, and just use
   // a multiple of the previous scale.
   // TODO(danakj): This seems crazy, we should use the current ideal, no?
   bool is_pinching = layer_tree_impl()->PinchGestureActive();
   if (is_pinching && old_raster_contents_scale) {
@@ skipping 628 matching lines @@
       PictureLayerTilingSet::TilingRange tiling_range = CurrentTilingRange();
       size_t current_tiling_range_offset = current_tiling_ - tiling_range.start;
       return tiling_range.end - 1 - current_tiling_range_offset;
     }
   }
   NOTREACHED();
   return 0;
 }
 
 }  // namespace cc