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RequestEncodingParametersChange() can configure the same
bitrate and framerate as the last configured values.
Since VaapiVieoEncodeAccelerator logs them every
RequestEncodingParametersChange(), it floods chrome logging.

As we are not interested in the unchanged values, this CL makes
VaapiVEA log the framerate and bitrate only if they vary.

Bug: None
Test: appr.tc/?vsc=h264&debug=loopback
Change-Id: Ie0354bc92b919c2bfcb4d2131de29e8e2736a4ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2082741Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746248}