DO NOT MERGE - libstagefright: check requested memory size before allocation for SoftMPEG4Encoder and SoftVPXEncoder. am: 50270d98e2 am: 1856f1fe34 am: 2c59cc083d  -s ours am: c653d2f19e am: 62646f8c4b am: 2b8d26ba65
am: 54e0e39693

* commit '54e0e3969337f566233ffabd407eaea63969c0a8':
  DO NOT MERGE - libstagefright: check requested memory size before allocation for SoftMPEG4Encoder and SoftVPXEncoder.