Add support for CheckedNumeric bitshift operators

base/numerics/safe_math.h

Index: base/numerics/safe_math.h
diff --git a/base/numerics/safe_math.h b/base/numerics/safe_math.h
index 41aa0515c1dfb17b2feccf28cff379965d720e18..74cc36ba567f7b20293e15026f2f5c8dc1d82f08 100644
--- a/base/numerics/safe_math.h
+++ b/base/numerics/safe_math.h
@@ -117,6 +117,10 @@ class CheckedNumeric {
   template <typename Src> CheckedNumeric& operator*=(Src rhs);
   template <typename Src> CheckedNumeric& operator/=(Src rhs);
   template <typename Src> CheckedNumeric& operator%=(Src rhs);
+  template <typename Src>

[Tom Sepez, 2016/11/17 00:29:45]

nit: format as above?

[jschuh, 2016/11/17 00:47:51]

Done. Stupid git cl format.

+  CheckedNumeric& operator<<=(Src rhs);
+  template <typename Src>
+  CheckedNumeric& operator>>=(Src rhs);
 
   CheckedNumeric operator-() const {
     // Negation is always valid for floating point.
@@ -240,6 +244,8 @@ BASE_NUMERIC_ARITHMETIC_OPERATORS(Sub, -, -=, MAX_EXPONENT_PROMOTION)
 BASE_NUMERIC_ARITHMETIC_OPERATORS(Mul, *, *=, MAX_EXPONENT_PROMOTION)
 BASE_NUMERIC_ARITHMETIC_OPERATORS(Div, /, /=, MAX_EXPONENT_PROMOTION)
 BASE_NUMERIC_ARITHMETIC_OPERATORS(Mod, %, %=, MAX_EXPONENT_PROMOTION)
+BASE_NUMERIC_ARITHMETIC_OPERATORS(LeftShift, <<, <<=, LEFT_PROMOTION)
+BASE_NUMERIC_ARITHMETIC_OPERATORS(RightShift, >>, >>=, LEFT_PROMOTION)
 
 #undef BASE_NUMERIC_ARITHMETIC_OPERATORS