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We want to count the last the last swap in the embedding
chain. Usually there is a hardware swap for this but on mac
there doesn't appear to be one. This uses the decoder swap
for now until we know the canonical swap call and add a trace
there.

TBR=nduca@chromium.org
NOTRY=true

No-try since this is blocking this from working on the mac and I've run the tests locally.

Review URL: https://codereview.chromium.org/141163004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245478 0039d316-1c4b-4281-b951-d872f2087c98