Add 2 APIs (suspend and resume) in MediaPlayer

- API:suspend() will just pause the player and release all the decoders
- instead of release the whole player
- API:resume() will just init the decoders again
- Add a check in onVideoEvent()
- to make sure the first seek operation will seek the next i-frame

Change-Id: Ia4716f7fb3a412eb19c6ded9c0f3056d0490546c

Implement the suspend/resume operation in VideoView

- Using the new APIs in Mediaplayer
  to implement the suspend/resume operation in VideoView
- Add a new status "SUSPENDED"

Change-Id: I00f9daa2d34b3b125b8c3b968bc581708ab2cdf4

HTML5 VideoView change to use the new APIs: suspend/resume

- While suspend and resume, using the new APIs in Mediaplayer

Change-Id: I8530b533501607f681145853d7923fdf2009150b
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