The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/aa066fd6ef4f2546faafdaf3abcb328fc6cc709c

commit aa066fd6ef4f2546faafdaf3abcb328fc6cc709c
Author: sunjian <sunjian@chromium.org>
Date: Mon Dec 12 23:14:07 2016

TransferSize implementation.

BUG= 663187 

Review-Url: https://codereview.chromium.org/2511313002
Cr-Commit-Position: refs/heads/master@{#437946}

[modify] https://crrev.com/aa066fd6ef4f2546faafdaf3abcb328fc6cc709c/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
[modify] https://crrev.com/aa066fd6ef4f2546faafdaf3abcb328fc6cc709c/third_party/WebKit/Source/core/fetch/ResourceFetcher.h
[modify] https://crrev.com/aa066fd6ef4f2546faafdaf3abcb328fc6cc709c/third_party/WebKit/Source/core/fetch/ResourceFetcherTest.cpp
[modify] https://crrev.com/aa066fd6ef4f2546faafdaf3abcb328fc6cc709c/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
[modify] https://crrev.com/aa066fd6ef4f2546faafdaf3abcb328fc6cc709c/third_party/WebKit/Source/core/loader/DocumentLoader.h
[modify] https://crrev.com/aa066fd6ef4f2546faafdaf3abcb328fc6cc709c/third_party/WebKit/Source/core/timing/PerformanceBase.cpp

Yay, great to see this land!
Let's add the isHttp check as suggested by tyoshino and wrap this up.