Add "throws IOException" to MediaCodec constructors (3)

Change to add "throws IOException" to android.media.MediaCodec
(createByCodecName|createDecoderByType|createEncoderByType).  The exception was
previously thrown through the native JNI, but not explicitly declared.

Requires changes to existing code for declaration compatibility.

Bug: 11364276
Change-Id: Ia0d3481397285cb1503bedde37d4651934b3a481
Signed-off-by: Andy Hung <hunga@google.com>