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GDataOperationRegistry needs this information to provide user-friendly list of in-flight operations.

BUG=chromium-os:27371
TEST=unit_test --gtest_filter='*GData*'

Review URL: https://chromiumcodereview.appspot.com/9705048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@126846 0039d316-1c4b-4281-b951-d872f2087c98