Retrieve per host storage usage from QuotaManager.

R=kinuko@chromium.org
BUG=none
TEST=QuotaManagerTest.GetUsage

Review URL: http://codereview.chromium.org/8079004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@103921 0039d316-1c4b-4281-b951-d872f2087c98
  UpdateAccessTimeTask(
      QuotaManager* manager,
      const GURL& origin,
      StorageType type,
      base::Time accessed_time)
      : DatabaseTaskBase(manager),
        origin_(origin),
        type_(type),
        accessed_time_(accessed_time) {}

  UpdateAccessTimeTask(
      QuotaManager* manager,
      const GURL& origin,
      StorageType type,
      base::Time accessed_time)
      : DatabaseTaskBase(manager),
        origin_(origin),
        type_(type),
        accessed_time_(accessed_time) {}
