Merge 230360 "[mac] Support adding the launcher to the Dock when..."

Merge 230360 "[mac] Support adding the launcher to the Dock when..."

> [mac] Support adding the launcher to the Dock when Dashboard.app is present.
> 
> Dashboard has a special tile-type of "dashboard-tile" (rather than
> "file-tile"), and no file-data, when it is present in a user's Dock.
> dock::AddIcon(..) currently emits an error when encountering these dock
> tiles.
> 
> This CL will detect the case of a Dock tile with no file-data, and
> substitute a dummy path (the empty string) to align with the source data
> dictionary.
> 
> For the App Launcher, this CL also adds some error handling for
> dock::AddIcon. This allows the app launcher creation code to pop up the
> Finder window when adding the icon to the Dock fails.
> 
> BUG=309941
> TEST=Drag "Dashboard" from /Applications to the Dock, and enable the app
> launcher in a fresh Chrome install. You should get an app launcher added
> to the Dock.
> 
> Review URL: https://codereview.chromium.org/32563004

TBR=tapted@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=230851

[tapted, 2013-10-24 22:35:13]

Committed patchset #1 manually as r230851.