Enable the views-based AppInfoDialog on Mac

Enable the views-based AppInfoDialog on Mac

There's an expected ~443kB sizes regression in ChromiumFramework with
this. This is because large portions of views.dylib are still culled at
link time with -dead_strip, but this CL makes more symbols reachable.
For a full accounting see http://crbug.com/485854#c1 (nothing
unexpected).

The dialog is enabled by linking in app_info_dialog_views.cc to provide
functions previously provided (but NOTIMPLEMENTED()) by
app_info_dialog_cocoa.mm.

Note that the views CanShowAppInfoDialog() is implemented as
IsMacViewsAppListListEnabled(), so no user-visible changes occur unless
Chrome is run from the command line with --enable-mac-views-app-list.

With this flag, the `Details` link at chrome://extensions will show the
views-based (and offline-enabled) AppInfo dialog rather than taking the
user to the webstore URL. And the context menu for icons at
chrome://apps will have an `App Info` option.

(Note that the views-based App Launcher isn't currently linked in on
Mac, so the app launcher shown with --enable-mac-views-app-list
--show-app-list doesn't support this dialog yet).

Screenshot at http://crbug.com/485854#c2

BUG=485854

Review URL: https://codereview.chromium.org/1048343002

Cr-Commit-Position: refs/heads/master@{#329362}