Create a Lite Page bit for previews and fallback to Lo-Fi

Create a Lite Page bit for previews and fallback to Lo-Fi

If a lite-page is requested and the server does not provide one, Chrome
should request a Lo-Fi image on subresources. However, Chrome should
not request empty-image on the subresource requests of a Weblite page.

BUG=660212
Review-Url: https://codereview.chromium.org/2642793005
Cr-Commit-Position: refs/heads/master@{#454638}
(cherry picked from commit 3f4bae9092c2ac1443f2c26867b7fad7f10df1ca)

Review-Url: https://codereview.chromium.org/2732773002 .
Cr-Commit-Position: refs/branch-heads/3029@{#6}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/e1725ef3c99b3ea313fe81b855a7d0568e540d38

[megjablon, 2017-03-04 01:04:06]

Description was changed from

==========
Create a Lite Page bit for previews and fallback to Lo-Fi

If a lite-page is requested and the server does not provide one, Chrome
should request a Lo-Fi image on subresources. However, Chrome should
not request empty-image on the subresource requests of a Weblite page.

BUG=660212

Review-Url: https://codereview.chromium.org/2642793005
Cr-Commit-Position: refs/heads/master@{#454638}
(cherry picked from commit 3f4bae9092c2ac1443f2c26867b7fad7f10df1ca)
==========

to

==========
Create a Lite Page bit for previews and fallback to Lo-Fi

If a lite-page is requested and the server does not provide one, Chrome
should request a Lo-Fi image on subresources. However, Chrome should
not request empty-image on the subresource requests of a Weblite page.

BUG=660212

Review-Url: https://codereview.chromium.org/2642793005
Cr-Commit-Position: refs/heads/master@{#454638}
(cherry picked from commit 3f4bae9092c2ac1443f2c26867b7fad7f10df1ca)

Review-Url: https://codereview.chromium.org/2732773002 .
Cr-Commit-Position: refs/branch-heads/3029@{#6}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/e1725ef3c99b3ea313fe81b855a7...
==========

[megjablon, 2017-03-04 01:04:08]

Committed patchset #1 (id:1) manually as
e1725ef3c99b3ea313fe81b855a7d0568e540d38.