Add Click to Open PDF Placeholder feature

Add Click to Open PDF Placeholder feature

Create this feature and have it disabled while it's under development.

BUG=737787
Review-Url: https://codereview.chromium.org/2956373003
Cr-Commit-Position: refs/heads/master@{#483403}
Committed: https://chromium.googlesource.com/chromium/src/+/3da52ff61da23b01c1a87fb8d253cd1dd585e9ac

[amberwon, 2017-06-28 23:24:56]

The CQ bit was checked by amberwon@google.com to run a CQ dry run

[commit-bot: I haz the power, 2017-06-28 23:25:29]

Dry run: CQ is trying da patch.

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

[amberwon, 2017-06-28 23:41:47]

amberwon@google.com changed reviewers:
+ tommycli@chromium.org

[tommycli, 2017-06-29 00:30:41]

lgtm with one request: beef up the commit description

[amberwon, 2017-06-29 00:43:40]

Description was changed from

==========
Add feature

BUG=737787
==========

to

==========
Add Click to Open PDF Placeholder feature

Create this feature and have it disabled while it's under development.

BUG=737787
==========

[commit-bot: I haz the power, 2017-06-29 01:14:25]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-06-29 01:14:26]

Dry run: This issue passed the CQ dry run.

[amberwon, 2017-06-29 17:09:19]

On 2017/06/29 00:30:41, tommycli wrote:
> lgtm with one request: beef up the commit description

Done

[amberwon, 2017-06-29 17:09:26]

The CQ bit was checked by amberwon@google.com

[commit-bot: I haz the power, 2017-06-29 17:09:39]

CQ is trying da patch.

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

[commit-bot: I haz the power, 2017-06-29 17:13:06]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1498756166362080, "parent_rev":
"e2998ecdcb0ab6991e4b8e8c592af24c478ef273", "commit_rev":
"3da52ff61da23b01c1a87fb8d253cd1dd585e9ac"}

[commit-bot: I haz the power, 2017-06-29 17:13:16]

Description was changed from

==========
Add Click to Open PDF Placeholder feature

Create this feature and have it disabled while it's under development.

BUG=737787
==========

to

==========
Add Click to Open PDF Placeholder feature

Create this feature and have it disabled while it's under development.

BUG=737787

Review-Url: https://codereview.chromium.org/2956373003
Cr-Commit-Position: refs/heads/master@{#483403}
Committed:
https://chromium.googlesource.com/chromium/src/+/3da52ff61da23b01c1a87fb8d253...
==========

[commit-bot: I haz the power, 2017-06-29 17:13:17]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/3da52ff61da23b01c1a87fb8d253...