Commiting user-submitted patches: Patch from Abdul Qabiz and a patch from Myo Thein.
Fix bug around playHeadTime in VideoDisplay so it resets the time when the source is changed.
Fix bug around FormItem when the width/height is explicitly set and direction="horizontal".
QE Notes: Write tests for this.
Doc Notes: None
Bugs: SDK-18733, SDK-20318, SDK-20299, SDK-15631
tests: checkintests, mustella tests for FormItem, VideoDisplay (some VideoDisplay ones were failing, but I think this patch should be fine to checkin)