Rename cc::ScrollNode's inner and outer viewport members

cc/trees/scroll_node.h

 // Copyright 2016 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.
 
 #ifndef CC_TREES_SCROLL_NODE_H_
 #define CC_TREES_SCROLL_NODE_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/output/filter_operations.h"
 #include "ui/gfx/geometry/size.h"
@@ skipping 29 matching lines @@
   bool contains_non_fast_scrollable_region;
 
   // Size of the clipped area, not including non-overlay scrollbars. Overlay
   // scrollbars do not affect the clipped area.
   gfx::Size scroll_clip_layer_bounds;
 
   // Bounds of the overflow scrolling area.
   gfx::Size bounds;
 
   bool max_scroll_offset_affected_by_page_scale;
-  bool is_inner_viewport_scroll_layer;
-  bool is_outer_viewport_scroll_layer;
+  bool scrolls_inner_viewport;
+  bool scrolls_outer_viewport;
 
   // This offset is used when |scrollable| is false and there isn't a transform
   // node already present that covers this offset.
   gfx::Vector2dF offset_to_transform_parent;
 
   bool should_flatten;
   bool user_scrollable_horizontal;
   bool user_scrollable_vertical;
   ElementId element_id;
   int transform_id;
 
   bool operator==(const ScrollNode& other) const;
   void AsValueInto(base::trace_event::TracedValue* value) const;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_SCROLL_NODE_H_