Extract subpixel offsets from composited layer transforms when possible.

cc/layers/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/layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1206 matching lines @@
 }
 
 void LayerImpl::GatherFrameTimingRequestIds(std::vector<int64_t>* request_ids) {
   for (const auto& request : frame_timing_requests_)
     request_ids->push_back(request.id());
 }
 
 void LayerImpl::SetTransform(const gfx::Transform& transform) {
   if (transform_ == transform)
     return;
+  transform_ = transform;
 
-  transform_ = transform;
   transform_is_invertible_ = transform_.IsInvertible();
 }
 
 void LayerImpl::SetTransformAndInvertibility(const gfx::Transform& transform,
                                              bool transform_is_invertible) {
   if (transform_ == transform) {
     DCHECK(transform_is_invertible_ == transform_is_invertible)
         << "Can't change invertibility if transform is unchanged";
     return;
   }
@@ skipping 365 matching lines @@
            .layer_transforms_should_scale_layer_contents) {
     return default_scale;
   }
 
   gfx::Vector2dF transform_scales = MathUtil::ComputeTransform2dScaleComponents(
       DrawTransform(), default_scale);
   return std::max(transform_scales.x(), transform_scales.y());
 }
 
 }  // namespace cc