<webview>: Zooming the embedder should zoom the guest by the same level.

<webview>: Zooming the embedder should zoom the guest by the same level.

Note: Currently this solution is implemented in the chrome module but once
ZoomController moves to extensions, zooming from embedder to guest should
move to GuestViewBase and a more general solution should be made available
for GuestView types that wish to receive this zoom plumbing.

BUG=416581
Committed: https://crrev.com/4253aba6222fecb87d07eebe50a2e34a034fb19c
Cr-Commit-Position: refs/heads/master@{#296540}

[Fady Samuel, 2014-09-24 20:51:46]

fsamuel@chromium.org changed reviewers:
+ xiyuan@chromium.org

[xiyuan, 2014-09-24 20:59:46]

LGTM

Thank you for the quick fix.

[Fady Samuel, 2014-09-24 21:15:02]

The CQ bit was checked by fsamuel@chromium.org

[commit-bot: I haz the power, 2014-09-24 21:15:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/598163003/40001

[commit-bot: I haz the power, 2014-09-24 22:11:05]

Committed patchset #3 (id:40001) as 60304758b9bae5d05287d40209b48418c7188d84

[commit-bot: I haz the power, 2014-09-24 22:11:33]

Patchset 3 (id:??) landed as
https://crrev.com/4253aba6222fecb87d07eebe50a2e34a034fb19c
Cr-Commit-Position: refs/heads/master@{#296540}