Make sure filter buffer is flushed after it fills its output quota...

Make sure filter buffer is flushed after it fills its output quota

In some cases, when the filter returned but the output buffer was full,
the ReadFilteredData code was not "bothering" to call the filter again
(because there was no more input data to provide).  We now maintain
state indicating that the output buffer was filled (last time) and use
that to ensure we call the filter(s) again when Read is next called.

bug=7985
Original Review URL: http://codereview.chromium.org/27073

(Merge r10244 to the release branch)

R= jar

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=10538

[jar (doing other things), 2009-03-01 05:20:48]

LGTM