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First, make mojo support deliver storage type, this is needed for
v4l2_video_encode_accelerator to read DMABUF correctly, otherwise
it will use kShmem. Sencond, DMABUF contains stride, size, and file
handle, add the conversion code between VideoFrameData and VideoFrame.
Current implementation only support 2 planes DMABUF for NV12, if we'll
support more format, may need to modify some code to support them.

BUG=chromium:963812
TEST=Deliver DMABUF frame from camera and send it into video encoder
through mojo interface, and it can encode correct video out.

Change-Id: Ibf9614b6389e080bc0599226c4a20a410bb9666b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1631160
Commit-Queue: Fish Lin <linfish@google.com>
Auto-Submit: Fish Lin <linfish@google.com>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665061}