Fix testi420 unittest for odd height

Fix testi420 unittest for odd height

When the image height for unittests was set to an
odd height, the TestI420 unittest would not fill
the complete source buffer.  This change handles
the odd height test case.
No change to library code.

TBR=harryjin@google.com
BUG=libyuv:549
Committed: https://chromium.googlesource.com/libyuv/libyuv/+/8c196f4d4ce0fc806f0c3543212a50c04d0296b2

[fbarchard, 2016-01-20 00:16:38]

Description was changed from

==========
Fix testi420 unittest for odd height

When the image height for unittests was set to an
odd height, the TestI420 unittest would not fill
the complete source buffer.  This change handles
the odd height test case.
No change to library code.

TBR=harryjin@google.com
BUG=libyuv:549
==========

to

==========
Fix testi420 unittest for odd height

When the image height for unittests was set to an
odd height, the TestI420 unittest would not fill
the complete source buffer.  This change handles
the odd height test case.
No change to library code.

TBR=harryjin@google.com
BUG=libyuv:549
==========

[fbarchard1, 2016-01-20 00:16:42]

Description was changed from

==========
Fix testi420 unittest for odd height

When the image height for unittests was set to an
odd height, the TestI420 unittest would not fill
the complete source buffer.  This change handles
the odd height test case.
No change to library code.

TBR=harryjin@google.com
BUG=libyuv:549
==========

to

==========
Fix testi420 unittest for odd height

When the image height for unittests was set to an
odd height, the TestI420 unittest would not fill
the complete source buffer.  This change handles
the odd height test case.
No change to library code.

TBR=harryjin@google.com
BUG=libyuv:549

Committed:
https://chromium.googlesource.com/libyuv/libyuv/+/8c196f4d4ce0fc806f0c3543212...
==========

[fbarchard1, 2016-01-20 00:16:43]

Committed patchset #1 (id:1) manually as
8c196f4d4ce0fc806f0c3543212a50c04d0296b2 (presubmit successful).