GitLab

This CL adds ImageProcessorWithPool class, which is a simple client of
ImageProcessor. By injecting a DmabufVideoFramePool for allocating
output frames and a callback for receiving processed frames, the
caller could process input frames by Process() without managing output
buffer.

BUG=chromium:1004727
TEST=ninja image_processor_test

Change-Id: I472366e4bf9460a304fcc8c4d43277c21e16c2c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918917Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716086}