Merge tag android-5.1.0_r1 into AOSP_5.1_MERGE

Change-Id: Ibbb1c6d1c760f9cb9a4a241725244eb895477e49
tree: b6be863f1faff7b11bf27880d4a7334b95d8f4b0
  1. videodecoder/
  2. videoencoder/
  3. Android.mk
  4. README