Reland "Raster display item lists via a visual rect RTree."

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";
 import "rectf.proto";
 import "transform.proto";
 
 option optimize_for = LITE_RUNTIME;
 
 package cc.proto;
 
 message DisplayItemListSettings {
   optional bool use_cached_picture = 1;
 }
 
 message DisplayItemList {
   repeated DisplayItem items = 1;
-  optional cc.proto.Rect layer_rect = 2;
   optional DisplayItemListSettings settings = 3;
+  repeated cc.proto.Rect visual_rects = 4;
 }
 
 message DisplayItem {
   enum Type {
     Type_Clip = 1;
     Type_EndClip = 2;
     Type_ClipPath = 3;
     Type_EndClipPath = 4;
     Type_Compositing = 5;
     Type_EndCompositing = 6;
@@ skipping 52 matching lines @@
   // TODO(dtrainor): Support FilterOperations.
 }
 
 message FloatClipDisplayItem {
   optional cc.proto.RectF clip_rect = 1;
 }
 
 message TransformDisplayItem {
   optional cc.proto.Transform transform = 1;
 }