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This CL introduces an option, --save_images, to save processed images in
ImageProcessor test. The usage documentation of image_processor_test will
also be shown with --help.

This CL enables VideoFrameFileWriter to save memory based VideoFrame, not only
DmaBuf-backed VideoFrame.

Bug: 917951
Test: image_processor_tests --save_images on atlas
Change-Id: I4b4d87bb564873fac0f1a0f51f3a4296a2d9bb1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774011
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692025}