Fix scrollIntoViewIfNeeded when scroll box has no height or width.

third_party/WebKit/Source/platform/LayoutUnit.h

 /*
  * Copyright (c) 2012, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 44 matching lines @@
 const int intMinForLayoutUnit = INT_MIN / kFixedPointDenominator;
 
 // TODO(thakis): Remove these two lines once http://llvm.org/PR26504 is resolved
 class LayoutUnit;
 inline bool operator<(const LayoutUnit&, const LayoutUnit&);
 
 class LayoutUnit {
     DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 public:
     LayoutUnit() : m_value(0) { }
-    // TODO(leviw): All of the below constructors should be explicit. crbug.com/581254
     explicit LayoutUnit(int value) { setValue(value); }
     explicit LayoutUnit(unsigned short value) { setValue(value); }
     explicit LayoutUnit(unsigned value) { setValue(value); }
     explicit LayoutUnit(unsigned long value) { m_value = clampTo<int>(value * kFixedPointDenominator); }
     explicit LayoutUnit(unsigned long long value) { m_value = clampTo<int>(value * kFixedPointDenominator); }
     explicit LayoutUnit(float value) { m_value = clampTo<int>(value * kFixedPointDenominator); }
     explicit LayoutUnit(double value) { m_value = clampTo<int>(value * kFixedPointDenominator); }
 
     static LayoutUnit fromFloatCeil(float value)
     {
@@ skipping 732 matching lines @@
 }
 
 inline std::ostream& operator<<(std::ostream& stream, const LayoutUnit& value)
 {
     return stream << value.toDouble();
 }
 
 } // namespace blink
 
 #endif // LayoutUnit_h