Record add to homescreen events with URL from the owning web contents.

Record add to homescreen events with URL from the owning web contents.

This change fixes a bug in 42 which is triggered if the start URL from
the manifest is not the same as the current page. In this case, the
fact that the shortcut was added is not remembered, causing the banner
to come up in future.

BUG=474631
Committed: https://crrev.com/ee0b4d8b42ca2da99dd6ea1dac62690fa0a747bc
Cr-Commit-Position: refs/heads/master@{#324198}

[benwells, 2015-04-08 03:07:32]

benwells@chromium.org changed reviewers:
+ dfalcantara@chromium.org

[benwells, 2015-04-08 03:07:33]

This isn't yet tested but trying to get an early review. I'll test before
landing.

[gone, 2015-04-08 03:11:02]

lgtm, should be fine

[benwells, 2015-04-08 08:16:51]

benwells@chromium.org changed reviewers:
+ bauerb@chromium.org

[benwells, 2015-04-08 08:16:52]

+bauerb for owners review. This is to be merged into 42 to fix the referenced
bug.

[benwells, 2015-04-08 08:17:17]

On 2015/04/08 08:16:52, benwells wrote:
> +bauerb for owners review. This is to be merged into 42 to fix the referenced
> bug.

(btw i've tested this now on something approximating M42)

[Bernhard Bauer, 2015-04-08 08:18:23]

lgtm

[benwells, 2015-04-08 08:18:43]

The CQ bit was checked by benwells@chromium.org

[commit-bot: I haz the power, 2015-04-08 08:19:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1065153002/1

[commit-bot: I haz the power, 2015-04-08 08:22:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-08 08:23:45]

Patchset 1 (id:??) landed as
https://crrev.com/ee0b4d8b42ca2da99dd6ea1dac62690fa0a747bc
Cr-Commit-Position: refs/heads/master@{#324198}