Add a helper class that keeps per-profile information for FileSystem API

Reapplying with the correct constructor order in resource_message_filter.

The original one was: http://codereview.chromium.org/3028033
Reverted due to rebase/merge failure: http://codereview.chromium.org/3243005

BUG=32277
TEST=FileSystemHostContextTest
TBR=dmazzoni

Review URL: http://codereview.chromium.org/3244002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57733 0039d316-1c4b-4281-b951-d872f2087c98
13 files changed