cc: Stop locking the raster scale factor at 1 after any change.

cc/layers/picture_layer_impl.h

 // 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.
 
 #ifndef CC_LAYERS_PICTURE_LAYER_IMPL_H_
 #define CC_LAYERS_PICTURE_LAYER_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 129 matching lines @@
   float ideal_device_scale_;
   float ideal_source_scale_;
   float ideal_contents_scale_;
 
   float raster_page_scale_;
   float raster_device_scale_;
   float raster_source_scale_;
   float raster_contents_scale_;
   float low_res_raster_contents_scale_;
 
-  bool raster_source_scale_is_fixed_;
   bool was_screen_space_transform_animating_;
   bool only_used_low_res_last_append_quads_;
   const bool is_mask_;
 
   bool nearest_neighbor_;
 
   // Any draw properties derived from |transform|, |viewport|, and |clip|
   // parameters in LayerTreeHostImpl::SetExternalDrawConstraints are not valid
   // for prioritizing tiles during resourceless software draws. This is because
   // resourceless software draws can have wildly different transforms/viewports
@@ skipping 10 matching lines @@
   // of comparing pointers, since objects pointed to are not guaranteed to
   // exist.
   std::vector<PictureLayerTiling*> last_append_quads_tilings_;
 
   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_PICTURE_LAYER_IMPL_H_