Move border-*-width out of BorderValue and store on SurroundData in ComputedStyle instead

third_party/WebKit/Source/core/style/ComputedStyleConstants.h

Index: third_party/WebKit/Source/core/style/ComputedStyleConstants.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
index ae5e07ab75492cd45695103badfe4ee9dfcc8ab3..8fd1c06fde2231811e7bfa36daa6441909dbd773 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
@@ -499,6 +499,16 @@ enum ScrollSnapType {
 
 enum AutoRepeatType { kNoAutoRepeat, kAutoFill, kAutoFit };
 
+// In order to conserve memory, the border width uses fixed point,
+// which can be bitpacked.  This fixed point implementation is
+// essentially the same as in LayoutUnit.  Six bits are used for the
+// fraction, which leaves 20 bits for the integer part, making 1048575
+// the largest number.
+
+static const int kBorderWidthFractionalBits = 6;
+static const int kBorderWidthDenominator = 1 << kBorderWidthFractionalBits;
+static const int kMaxForBorderWidth = ((1 << 26) - 1) / kBorderWidthDenominator;
+
 }  // namespace blink
 
 #endif  // ComputedStyleConstants_h