search: Log when bookmark bar is pinned.

We want to understand how showing search terms in the omnibox interacts
with the presence of the bookmark bar. For users in a field trial that's
showing search terms, this change adds a CGI arg &bmbp=1 to search URLs
if the bookmark bar is pinned and &bmbp=0 otherwise.

This isn't privacy-sensitive, because in theory we could get this
information by looking at outerHeight - innerHeight from search page
Javascript. Logging it explicitly this way is just more reliable than
doing that.

BUG=291244
TEST=unit tests,manual

Review URL: https://codereview.chromium.org/25324003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226506 0039d316-1c4b-4281-b951-d872f2087c98
Disable TabStripModelTest.FastShutdown on Mac 64.

BUG=302156
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/25756003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226507 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226507
Media Galleries API: Fix MediaGalleriesPreferences initialization for fresh profiles.

BUG=151701, 295880
R=vandebo@chromium.org

Review URL: https://codereview.chromium.org/25539003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226509 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226509