[Extension Toolbar Redesign] Wants to act treatment, redux - left click

[Extension Toolbar Redesign] Wants to act treatment, redux - left click

The bug fully describes the new behavior for an extension that wants to act
with the toolbar redesign turned on. This patch implements the new left-click
behavior, so that an otherwise-disabled extension action's clicks forward to
the context menu. That is, right clicking on a page action that wouldn't
previously be showing opens the menu, instead of running the action. (The user
can know when this will happen based on the extension action's enabled/disabled
state, which is indicated by greyscaling the action when disabled.)

BUG=417441
TBR=sky@chromium.org (media router action)

Committed: https://crrev.com/ac27cf3acc998b9e19b2a677e0ffb02378860cca
Cr-Commit-Position: refs/heads/master@{#338067}

[Devlin, 2015-07-07 22:44:56]

Patchset #1 (id:1) has been deleted

[Devlin, 2015-07-07 22:45:01]

Patchset #1 (id:20001) has been deleted

[Devlin, 2015-07-07 22:45:07]

Patchset #1 (id:40001) has been deleted

[Devlin, 2015-07-07 23:03:32]

Patchset #2 (id:80001) has been deleted

[Devlin, 2015-07-07 23:35:17]

rdevlin.cronin@chromium.org changed reviewers:
+ avi@chromium.org, finnur@chromium.org

[Finnur, 2015-07-08 14:36:40]

LGTM

[Avi (use Gerrit), 2015-07-08 18:39:27]

Cocoa lgtm

[Devlin, 2015-07-09 16:58:36]

The CQ bit was checked by rdevlin.cronin@chromium.org

[commit-bot: I haz the power, 2015-07-09 16:59:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1216053013/100001

[commit-bot: I haz the power, 2015-07-09 17:12:42]

Committed patchset #2 (id:100001)

[commit-bot: I haz the power, 2015-07-09 17:13:48]

Patchset 2 (id:??) landed as
https://crrev.com/ac27cf3acc998b9e19b2a677e0ffb02378860cca
Cr-Commit-Position: refs/heads/master@{#338067}