BUG=319
TESTED=GYP_DEFINES="OS=ios target_arch=armv7 target_subarch=64" GYP_CROSSCOMPILE=1 GYP_GENERATOR_FLAGS="output_dir=out_ios" ./build/gyp_chromium -f ninja --depth=. libyuv_test.gyp  && ninja -j7 -C out_ios/Debug-iphoneos
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/10909004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@994 16f28f9a-4ce2-e073-06de-1de4eb20be90