Enable logging of Chromoting performance statistics in Android client.

BUG=295769
NOTRY=true

Review URL: https://codereview.chromium.org/59773006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235283 0039d316-1c4b-4281-b951-d872f2087c98
Revert "Revert 234367 "Base: Make RegistryOverrideManager support sharde...""

This reverts commit 98ee7dd64463c42a076782c923330107e60b8fad.

Reapply of https://codereview.chromium.org/57423008 now that a blocking issue has been fixed.

BUG=314800
TBR=grt,owners

Review URL: https://codereview.chromium.org/68743005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235284 0039d316-1c4b-4281-b951-d872f2087c98
Docserver: Make IntroDataSource implement DataSource. Just a code shuffle.

BUG=275039
R=yoz@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/73463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235285 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235285