Merge commit 'v1.13.0' into m/master

* commit 'd6eb9696aa72473c1a11d34d928d35a3acc0c9a9': (188 commits)
  Fix unsigned integer overflow in sse computation
  Update AUTHORS .mailmap and version
  Fix per frame qp for temporal layers
  Update CHANGELOG
  Skip calculating internal stats when frame dropped
  Specialize Neon averaging subpel variance by filter value
  Refactor Neon averaging subpel variance functions
  Specialize Neon subpel variance by filter value for large blocks
  Refactor Neon subpel variance functions
  Add codec control to set per frame QP
  */Android.mk: add a check for NDK_ROOT
  Refactor Neon implementation of variance functions
  Fix to segfault for external resize test in vp9
  variance_test.cc: Enable HBDMse speed test.
  variance_test.cc: Enable VpxHBDMseTest for C and SSE2.
  Implement vertical convolutions using Neon USDOT instruction
  Implement horizontal convolutions using Neon USDOT instruction
  build: replace egrep with grep -E
  Use Neon load/store helper functions consistently
  Use lane-referencing intrinsics in Neon convolution kernels
  ...

Bug: https://crbug.com/webm/1780
Test: presubmit, builds for aosp_arm-eng, aosp_arm64-eng, \
      aosp_x86-eng, aosp_x86_64-eng, aosp_barbet-userdebug, \
      aosp_oriole-userdebug \
  panther_hwasan-userdebug: \
  - vts-tradefed run commandAndExit vts \
    --include-filter VtsHalMediaC2V1_0TargetVideoDecTest \
    --module-arg "VtsHalMediaC2V1_0TargetVideoDecTest:include-filter:*vp8*" \
    --module-arg "VtsHalMediaC2V1_0TargetVideoDecTest:include-filter:*vp9*" \
    --include-filter VtsHalMediaC2V1_0TargetVideoEncTest \
    --module-arg "VtsHalMediaC2V1_0TargetVideoEncTest:include-filter:*vp8*" \
    --module-arg "VtsHalMediaC2V1_0TargetVideoEncTest:include-filter:*vp9*" \
  - cts-tradefed run commandAndExit cts-dev \
    --include-filter CtsMediaDecoderTestCases \
    --module-arg "CtsMediaDecoderTestCases:include-filter:.*(?i:vp[89])" \
    --include-filter CtsMediaV2TestCases \
    --module-arg "CtsMediaV2TestCases:include-filter:.*(?i:vp[89])" \
    --include-filter CtsMediaEncoderTestCases \
    --module-arg "CtsMediaEncoderTestCases:include-filter:.*(?i:vp[89])" \
    --include-filter CtsVideoTestCases \
    --module-arg "CtsVideoTestCases:include-filter:.*(?i:vp[89])"
Change-Id: Iac91cb8b90a745a836a22109e52658a809642414