The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cfa9dd423a171356f71478605f903b6410fe7861

commit cfa9dd423a171356f71478605f903b6410fe7861
Author: hiroshige <hiroshige@chromium.org>
Date: Sat Feb 11 00:03:38 2017

Temporarily introduce ImageResourceInfo::setIsPlaceholder()

This is for https://codereview.chromium.org/2543073002, and
setIsPlaceholder() will be removed later in the refactoring.

BUG= 657995 , 667641, 677188

Review-Url: https://codereview.chromium.org/2638383008
Cr-Commit-Position: refs/heads/master@{#449795}

[modify] https://crrev.com/cfa9dd423a171356f71478605f903b6410fe7861/third_party/WebKit/Source/core/loader/resource/ImageResource.cpp
[modify] https://crrev.com/cfa9dd423a171356f71478605f903b6410fe7861/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.cpp
[modify] https://crrev.com/cfa9dd423a171356f71478605f903b6410fe7861/third_party/WebKit/Source/core/loader/resource/ImageResourceInfo.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a2ef21fb88052a7c445d8646430170eb8e4447fd

commit a2ef21fb88052a7c445d8646430170eb8e4447fd
Author: sclittle <sclittle@chromium.org>
Date: Wed Feb 15 23:09:33 2017

Don't show a placeholder if the response contains the full image.

When attempting to load a placeholder image, it's possible that the
response contains the full image, e.g. if the image is smaller than the
requested range (e.g. requested the first 2KB of a 1KB image), if the
server ignored the range request header and returned a full 200
response, etc.

In these cases, this CL causes the full image to be shown and not get
treated as a placeholder image, instead of just showing a nondescript
placeholder image.

In order to detect when range responses contain the full image, this CL
refactors Content-Range response header parsing into http_util and
exposes it to Blink.

BUG= 657995 

Review-Url: https://codereview.chromium.org/2543073002
Cr-Commit-Position: refs/heads/master@{#450830}

[modify] https://crrev.com/a2ef21fb88052a7c445d8646430170eb8e4447fd/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.cpp
[modify] https://crrev.com/a2ef21fb88052a7c445d8646430170eb8e4447fd/third_party/WebKit/Source/core/loader/resource/ImageResourceTest.cpp
[modify] https://crrev.com/a2ef21fb88052a7c445d8646430170eb8e4447fd/third_party/WebKit/Source/platform/network/HTTPParsers.cpp
[modify] https://crrev.com/a2ef21fb88052a7c445d8646430170eb8e4447fd/third_party/WebKit/Source/platform/network/HTTPParsers.h