Add Exif and IPC compatibility to JEA interface

This CL adds 2 things to JEA interface.

1. Exif. Currently HW JEA only encodes the image with APP0 JFIF segment.
After this CL, it accepts Exif buffer and would insert the APP1 segment
if Exif buffer is provided.

2. IPC compatibility.
IPC from ChromeOS side relies on the buffer ID to identify the encoded
results. The ID of VideoFrame is generated randomly at Chromium side
which ChromeOS doesn't know. The CL changes JEA interface to use output
buffer ID to identify each encode attemp.

BUG=819847
TEST=Verified that JEA can be used from ChromeOS side with Exif buffer.

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I87f13a435f9875999ca79dd5769fb925a9c59fb8
Reviewed-on: https://chromium-review.googlesource.com/954411


Commit-Queue: Sheng-hao Tsao <shenghao@google.com>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542200}