cc: Compute animation scale on demand

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 521 matching lines @@
     // corresponding Layer at the time of the last commit. For example, if
     // |is_animated| is false, this might mean a transform animation just ticked
     // past its finish point (so the LayerImpl still owns a TransformNode) or it
     // might mean that a transform animation was removed during commit or
     // activation (and, in that case, the LayerImpl will no longer own a
     // TransformNode, unless it has non-animation-related reasons for owning a
     // node).
     if (node->data.has_potential_animation != is_animated) {
       node->data.has_potential_animation = is_animated;
       if (is_animated) {
-        float maximum_target_scale = 0.f;
-        node->data.local_maximum_animation_target_scale =
-            MaximumTargetScale(&maximum_target_scale) ? maximum_target_scale
-                                                      : 0.f;
-
-        float animation_start_scale = 0.f;
-        node->data.local_starting_animation_scale =
-            AnimationStartScale(&animation_start_scale) ? animation_start_scale
-                                                        : 0.f;
-
         node->data.has_only_translation_animations =
             HasOnlyTranslationTransforms();
       } else {
-        node->data.local_maximum_animation_target_scale = 0.f;
-        node->data.local_starting_animation_scale = 0.f;
         node->data.has_only_translation_animations = true;
       }
 
       property_trees->transform_tree.set_needs_update(true);
       layer_tree_impl()->set_needs_update_draw_properties();
     }
   }
 }
 
 void LayerImpl::UpdatePropertyTreeOpacity(float opacity) {
@@ skipping 640 matching lines @@
            .layer_transforms_should_scale_layer_contents) {
     return default_scale;
   }
 
   gfx::Vector2dF transform_scales = MathUtil::ComputeTransform2dScaleComponents(
       ScreenSpaceTransform(), default_scale);
   return std::max(transform_scales.x(), transform_scales.y());
 }
 
 }  // namespace cc