Add profile info field for fileBrowserPrivate.getVolumeMetadataList().

This is preparation for multi-profile support in Files.app.
It is planned to show "Downloads" or "Google Drive" for all
accounts in one window. In Files.app UI, the profile info needs
to be annotated to each volume.

BUG=319420, 308381

Review URL: https://codereview.chromium.org/87733002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237892 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237892
SyncFS: Add test for file-file conflict case

BUG=240165
TEST=unit_tests --gtest_filter=RemoteToLocalSyncerTest.*
R=tzik@chromium.org

Review URL: https://codereview.chromium.org/96123003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237893 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237893