cc: Change ClipNode::applies_local_clip to a clip_type enum

cc/proto/property_tree.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 "element_id.proto";
 import "layer_sticky_position_constraint.proto";
 import "rectf.proto";
 import "scroll_offset.proto";
@@ skipping 59 matching lines @@
 }
 
 // Proto for StickyPositionNodeData
 message StickyPositionNodeData {
   optional int64 scroll_ancestor = 1;
   optional LayerStickyPositionConstraint constraints = 2;
   optional Vector2dF main_thread_offset = 3;
 }
 
 // Proto for struct ClipNodeData.
-// NEXT ID: 13
+// NEXT ID: 14
 message ClipNodeData {
+  enum ClipType {
+    NONE = 1;
+    APPLIES_LOCAL_CLIP = 2;
+  }
+  optional ClipType clip_type = 13;
   optional RectF clip = 1;
   optional RectF combined_clip_in_target_space = 2;
   optional RectF clip_in_target_space = 3;
 
   optional int64 transform_id = 4;
   optional int64 target_transform_id = 5;
   optional int64 target_effect_id = 12;
   optional bool applies_local_clip = 6;
   optional bool layer_clipping_uses_only_local_clip = 7;
   optional bool target_is_clipped = 8;
@@ skipping 135 matching lines @@
   optional bool full_tree_damaged = 12;
   optional int64 sequence_number = 6;
   optional bool is_main_thread = 13;
   optional bool is_active = 14;
 
   optional Vector2dF inner_viewport_container_bounds_delta = 8;
   optional Vector2dF outer_viewport_container_bounds_delta = 9;
   optional Vector2dF inner_viewport_scroll_bounds_delta = 10;
   repeated int64 always_use_active_tree_opacity_effect_ids = 15 [packed = true];
 }