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

* commit '2b8d26ba65596027d33e3855e1fb203214dfca2d':
  DO NOT MERGE - libstagefright: check requested memory size before allocation for SoftMPEG4Encoder and SoftVPXEncoder.