Observe LCD text restrictions during layer animations

cc/trees/layer_tree_host_common.cc

 // Copyright 2011 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/trees/layer_tree_host_common.h"
 
 #include <algorithm>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
@@ skipping 1879 matching lines @@
       SK_MScalar1 / layer->contents_scale_x(),
       SK_MScalar1 / layer->contents_scale_y());
 
   // The layer's screen_space_transform represents the transform between root
   // layer's "screen space" and local content space.
   layer_draw_properties.screen_space_transform =
       data_from_ancestor.full_hierarchy_matrix;
   layer_draw_properties.screen_space_transform.PreconcatTransform
       (layer_draw_properties.target_space_transform);
 
-  // Adjusting text AA method during animation may cause repaints, which in-turn
-  // causes jank.
-  bool adjust_text_aa =
-      !animating_opacity_to_screen && !animating_transform_to_screen;
   bool layer_can_use_lcd_text = true;
   bool subtree_can_use_lcd_text = true;
   if (!globals.layers_always_allowed_lcd_text) {
     // To avoid color fringing, LCD text should only be used on opaque layers
     // with just integral translation.
     subtree_can_use_lcd_text = data_from_ancestor.subtree_can_use_lcd_text &&
                                accumulated_draw_opacity == 1.f &&
                                layer_draw_properties.target_space_transform
                                    .IsIdentityOrIntegerTranslation();
     // Also disable LCD text locally for non-opaque content.
@@ skipping 224 matching lines @@
     // The surface's cached clip rect value propagates regardless of what
     // clipping goes on between layers here.
     clip_rect_of_target_surface_in_target_space =
         data_from_ancestor.clip_rect_of_target_surface_in_target_space;
 
     // Layers that are not their own render_target will render into the target
     // of their nearest ancestor.
     layer_draw_properties.render_target = layer->parent()->render_target();
   }
 
-  if (adjust_text_aa)
-    layer_draw_properties.can_use_lcd_text = layer_can_use_lcd_text;
+  layer_draw_properties.can_use_lcd_text = layer_can_use_lcd_text;
 
   gfx::Size content_size_affected_by_delta(layer->content_bounds());
 
   // Non-zero BoundsDelta imply the contents_scale of 1.0
   // because BoundsDela is only set on Android where
   // ContentScalingLayer is never used.
   DCHECK_IMPLIES(!BoundsDelta(layer).IsZero(),
                  (layer->contents_scale_x() == 1.0 &&
                   layer->contents_scale_y() == 1.0));
 
@@ skipping 596 matching lines @@
                                 PropertyTrees* trees_from_inputs) {
   return layer->layer_tree_host()->property_trees();
 }
 
 PropertyTrees* GetPropertyTrees(LayerImpl* layer,
                                 PropertyTrees* trees_from_inputs) {
   return trees_from_inputs;
 }
 
 }  // namespace cc