cc: Compute animation scale on demand

cc/layers/layer.cc

 // Copyright 2010 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.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1687 matching lines @@
   if (!property_trees->IsInIdToIndexMap(PropertyTrees::TreeType::TRANSFORM,
                                         id()))
     return;
   DCHECK_EQ(transform_tree_index(),
             property_trees->transform_id_to_index_map[id()]);
   TransformNode* node =
       property_trees->transform_tree.Node(transform_tree_index());
 
   node->data.has_potential_animation = has_potential_animation;
   if (has_potential_animation) {
-    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);
+  } else {
+    node->data.has_only_translation_animations = true;
+  }
+  property_trees->transform_tree.set_needs_update(true);
 }
 
 void Layer::OnOpacityIsCurrentlyAnimatingChanged(bool is_currently_animating) {
   DCHECK(layer_tree_host_);
   PropertyTrees* property_trees = layer_tree_host_->property_trees();
   if (!property_trees->IsInIdToIndexMap(PropertyTrees::TreeType::EFFECT, id()))
     return;
   DCHECK_EQ(effect_tree_index(), property_trees->effect_id_to_index_map[id()]);
   EffectNode* node = property_trees->effect_tree.Node(effect_tree_index());
   node->data.is_currently_animating_opacity = is_currently_animating;
@@ skipping 104 matching lines @@
       ->data.num_copy_requests_in_subtree;
 }
 
 gfx::Transform Layer::screen_space_transform() const {
   DCHECK_NE(transform_tree_index_, -1);
   return draw_property_utils::ScreenSpaceTransform(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc