title: YouTube video full screen mode switches activity-UI into landscape mode
body: <p>In my android app, I am playing a youtube video using <code>WebView</code> with <code>IFrame</code>. When the activity-UI is in portrait mode and I click on the youtube video at the bottom right corner to make it full screen, it appears to have have become full screen for a second. But then it switches back to original size quickly and the activity-UI goes into landscape mode.</p>