The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a1c1b90e415cd5fa064911e1cf4ac70ac8cb20a4

commit a1c1b90e415cd5fa064911e1cf4ac70ac8cb20a4
Author: jschuh <jschuh@chromium.org>
Date: Wed Nov 16 06:44:50 2016

Restructure ArithmeticPromotion to support alternate promotions

BUG= 665584 

Review-Url: https://codereview.chromium.org/2502083002
Cr-Commit-Position: refs/heads/master@{#432408}

[modify] https://crrev.com/a1c1b90e415cd5fa064911e1cf4ac70ac8cb20a4/base/numerics/safe_math.h
[modify] https://crrev.com/a1c1b90e415cd5fa064911e1cf4ac70ac8cb20a4/base/numerics/safe_math_impl.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3ab540427fc419718e96e8310e817a79a837efbb

commit 3ab540427fc419718e96e8310e817a79a837efbb
Author: jschuh <jschuh@chromium.org>
Date: Thu Nov 17 06:58:44 2016

Add support for CheckedNumeric bitshift operators

BUG= 665584 

Review-Url: https://codereview.chromium.org/2510973002
Cr-Commit-Position: refs/heads/master@{#432790}

[modify] https://crrev.com/3ab540427fc419718e96e8310e817a79a837efbb/base/numerics/safe_math.h
[modify] https://crrev.com/3ab540427fc419718e96e8310e817a79a837efbb/base/numerics/safe_math_impl.h
[modify] https://crrev.com/3ab540427fc419718e96e8310e817a79a837efbb/base/numerics/safe_numerics_unittest.cc