Add small test for blur BUG=none TEST=Blur* R=tpsiaki@google.com
Add small test for blur
BUG=none
TEST=Blur*
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/3309004
flykickbird/libyuv,flykickbird/libyuv,flykickbird/libyuv