Prevent current time jumping around when seek
Prevent current time jumping around when seek

BUG=19396
TEST=Open a .ogg file, seek, now the thumb won't jumps to 0 back and forth again.

Using a <video> to play a video file, when you seek
(especially ogg files) it will jump to time = 0 and
jumps back to the desired seek position back and forth.
This is because ogg files are muxed in a way that
audio packets have large gaps between valid timestamps.
This patch will avoid using invalid timestamps from
audio packets to estimate the current time.

Review URL: http://codereview.chromium.org/173027

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@23754 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser