DO NOT MERGE - libstagefright: check requested memory size before allocation for SoftMPEG4Encoder and SoftVPXEncoder. am: 6afc659b00 am: 9e1d7751b1  -s ours am: 4c0d243626 am: 862b693ba3  -s ours am: db76a879ea am: e0c9d8afd0
am: 2048dd5483  -s ours

* commit '2048dd5483c76892f5c5d54ad54e9782073bed5c':
  DO NOT MERGE - libstagefright: check requested memory size before allocation for SoftMPEG4Encoder and SoftVPXEncoder.