Add UMAs for media galleries scanning.

BUG=161119

Review URL: https://codereview.chromium.org/171423002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254001 0039d316-1c4b-4281-b951-d872f2087c98
cros: Update remora welcome string.

BUG=347355

Review URL: https://codereview.chromium.org/183343004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254003 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254003
Bump Syzygy binaries to r2045.

This brings in 0.7.9.0 of the SyzyASAN, which introduces quarantined block hashes to potentially catch use after free errors by uninstrumented system code.

BUG=

Review URL: https://codereview.chromium.org/183853002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254004 0039d316-1c4b-4281-b951-d872f2087c98
Add required header for RangeConstraint definition.

BUG=332611

Review URL: https://codereview.chromium.org/183753003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254005 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254006 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254006