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 am: 7a2dbcd38b
am: f766fdb625

* commit 'f766fdb62590cc3c233ba51c45f2b4aade6483d4':
  DO NOT MERGE - libstagefright: check requested memory size before allocation for SoftMPEG4Encoder and SoftVPXEncoder.