Added owners for common login-related code that was moved recently.

BUG=NONE
TBR=nkostylev@chromium.org,dpolukhin,ygorshenin,antrim@chromium.org,dzhioev,noms

Review URL: https://codereview.chromium.org/181003008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253768 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253768
Fixes webrtc-internals to properly handle negative values in the graphs.
Previously the graph drawing code assumes the minimum value displayed is 0.
Now it's extended to the actual value range including negative values.

BUG=347337

Review URL: https://codereview.chromium.org/182393003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253769 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253769
Enable QUIC packet pacing via field trial or command line flag.
Once we get results from the field trials, we can remove the flag.

R=rtenneti@chromium.org

Review URL: https://codereview.chromium.org/178063003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253770 0039d316-1c4b-4281-b951-d872f2087c98
Avoid returning an object from CreateBackgroundHost, since no callers use it.

This makes it easier for CreateBackgroundHost to use a different type for the
hosts of some extensions, which may be useful for the Service Worker backend.

BUG=347328

Review URL: https://codereview.chromium.org/177043006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253771 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253771