Add base class cr.ui.BubbleButton for options.ControlledSettingIndicator

Re-landing. The test failure this was reverted for is unrelated (the
failure was in native UI, this is a WebUI change).

This CL extracts a cr.ui.BubbleButton base class from the
options.ControlledSettingIndicator so that it can be shared with the
upcoming improved about:policy page.

BUG=134849
TEST=Manual

TBR=jhawkins@chromium.org


Review URL: https://chromiumcodereview.appspot.com/11907007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@176946 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed