Rename ScrollType helper and combine some redundant checks.

third_party/WebKit/Source/platform/scroll/ScrollTypes.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 61 matching lines @@
 };
 
 enum ScrollType {
   kUserScroll,
   kProgrammaticScroll,
   kClampingScroll,
   kCompositorScroll,
   kAnchoringScroll
 };
 
-inline bool ScrollTypeClearsFragmentAnchor(ScrollType scroll_type) {
+// An explicit scroll is one that was requested by the user or the webpage.
+// An implicit scroll is a side effect of a layout change.
+inline bool IsExplicitScrollType(ScrollType scroll_type) {
   return scroll_type == kUserScroll || scroll_type == kProgrammaticScroll ||
          scroll_type == kCompositorScroll;
 }
 
 // Convert logical scroll direction to physical. Physical scroll directions are
 // unaffected.
 inline ScrollDirectionPhysical ToPhysicalDirection(ScrollDirection direction,
                                                    bool is_vertical,
                                                    bool is_flipped) {
   switch (direction) {
@@ skipping 179 matching lines @@
       NOTREACHED();
       return ScrollGranularity::kScrollByPrecisePixel;
   }
 }
 
 typedef unsigned ScrollbarControlPartMask;
 
 }  // namespace blink
 
 #endif