The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7994ae1b005e8f02c1bd554e5006e0546e59c3e7

commit 7994ae1b005e8f02c1bd554e5006e0546e59c3e7
Author: yhirano <yhirano@chromium.org>
Date: Mon Feb 20 05:08:57 2017

Count Response construction with ReadableStream

We also start using MeasureAs for Response.body attribute.

BUG= 693006 

Review-Url: https://codereview.chromium.org/2704443007
Cr-Commit-Position: refs/heads/master@{#451557}

[modify] https://crrev.com/7994ae1b005e8f02c1bd554e5006e0546e59c3e7/third_party/WebKit/Source/core/frame/UseCounter.h
[modify] https://crrev.com/7994ae1b005e8f02c1bd554e5006e0546e59c3e7/third_party/WebKit/Source/modules/fetch/Body.cpp
[modify] https://crrev.com/7994ae1b005e8f02c1bd554e5006e0546e59c3e7/third_party/WebKit/Source/modules/fetch/Body.h
[modify] https://crrev.com/7994ae1b005e8f02c1bd554e5006e0546e59c3e7/third_party/WebKit/Source/modules/fetch/Response.cpp
[modify] https://crrev.com/7994ae1b005e8f02c1bd554e5006e0546e59c3e7/third_party/WebKit/Source/modules/fetch/Response.idl