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This enable LibYUVIP to convert YV12 image to NV12 image. I also add YV12->NV12
test case in image_processor_test. I correct the name of test image, which I
wrongly named bear_320x192.yv21.yuv.

Bug: 944823
Test: image_processor_test
Change-Id: I22614a0a626e3202e3a2c6ca9e0f77200c200c84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1541136
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#647133}