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We also add the interface using the old name GCMStatsRecorder.

This is in preparation to move GCMClient to gcm_driver component.
We're going to move GCMActivity, GCMClient, GCMClientImpl, and
GCMStatsRecorderImpl to gcm_driver component while keeping
GCMStatsRecorder interface in google_apis/gcm.

BUG=356716
TEST=existing tests due to no functionality changes
R=juyik@chromium.org, zea@chromium.org

Review URL: https://codereview.chromium.org/312553002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274641 0039d316-1c4b-4281-b951-d872f2087c98