Add png and jpg support to md_browser.

Add png and jpg support to md_browser.

This allows md_browser to preview Markdown output that includes
checked-in images.

BUG=None
TESTED=Manually, http://teravest3.bld:8080/user-doc.md

Review-Url: https://codereview.chromium.org/2754663002
Cr-Commit-Position: refs/heads/master@{#457234}
Committed: https://chromium.googlesource.com/chromium/src/+/9fc66c2cd53582af4f0ad3f4c6ebf169a16678bf

[teravest, 2017-03-15 14:38:53]

Description was changed from

==========
Add png and jpg support to md_browser.

This allows md_browser to preview Markdown output that includes
checked-in images.

BUG=None
TESTED=Manually, http://teravest3.bld:8080/user-doc.md
==========

to

==========
Add png and jpg support to md_browser.

This allows md_browser to preview Markdown output that includes
checked-in images.

BUG=None
TESTED=Manually, http://teravest3.bld:8080/user-doc.md
==========

[teravest, 2017-03-15 14:38:53]

teravest@chromium.org changed reviewers:
+ dpranke@chromium.org

[Dirk Pranke, 2017-03-15 22:02:30]

lgtm

[teravest, 2017-03-15 22:04:46]

The CQ bit was checked by teravest@chromium.org

[commit-bot: I haz the power, 2017-03-15 22:05:25]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[maste, 2017-03-15 22:05:52]

t.p.taeza@gmail.com changed reviewers:
+ t.p.taeza@gmail.com

[commit-bot: I haz the power, 2017-03-15 22:24:03]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489615486255730, "parent_rev":
"6cd3b43b3117224f92b14357161372d54d348d92", "commit_rev":
"9fc66c2cd53582af4f0ad3f4c6ebf169a16678bf"}

[commit-bot: I haz the power, 2017-03-15 22:24:46]

Description was changed from

==========
Add png and jpg support to md_browser.

This allows md_browser to preview Markdown output that includes
checked-in images.

BUG=None
TESTED=Manually, http://teravest3.bld:8080/user-doc.md
==========

to

==========
Add png and jpg support to md_browser.

This allows md_browser to preview Markdown output that includes
checked-in images.

BUG=None
TESTED=Manually, http://teravest3.bld:8080/user-doc.md

Review-Url: https://codereview.chromium.org/2754663002
Cr-Commit-Position: refs/heads/master@{#457234}
Committed:
https://chromium.googlesource.com/chromium/src/+/9fc66c2cd53582af4f0ad3f4c6eb...
==========

[commit-bot: I haz the power, 2017-03-15 22:24:47]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/9fc66c2cd53582af4f0ad3f4c6eb...