Allow background tab titles to use LCD AA.

cc/proto/display_item.proto

 // Copyright 2015 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.
 
 syntax = "proto2";
 
 import "skregion.proto";
 import "skrrect.proto";
 import "skxfermode.proto";
 import "rect.proto";
@@ skipping 50 matching lines @@
 }
 
 message ClipPathDisplayItem {
   optional cc.proto.SkRegion.Op clip_op = 1;
   optional bool antialias = 2;
   optional bytes clip_path = 3; /* SkPath */
 }
 
 message CompositingDisplayItem {
   optional uint32 alpha = 1;
-
   optional cc.proto.SkXfermode.Mode mode = 2;
   optional cc.proto.RectF bounds = 3;
   optional bytes color_filter = 4; /* SkColorFilter */
+  optional bool lcd_text_requires_opaque_layer = 5;
 }
 
 message DrawingDisplayItem {
   optional bytes picture = 1; /* SkPicture */
 }
 
 message FilterDisplayItem {
   optional cc.proto.RectF bounds = 1;
 
   // TODO(dtrainor): Support FilterOperations.
 }
 
 message FloatClipDisplayItem {
   optional cc.proto.RectF clip_rect = 1;
 }
 
 message TransformDisplayItem {
   optional cc.proto.Transform transform = 1;
 }