media: add ArcCamera3Service Mojo service

media: add ArcCamera3Service Mojo service
    
The ArcCamera3Service Mojo service serves as a proxy to establish the
connections between the camera clients (i.e. VideoCaptureDevice in Chrome
and cameraserver process in ARC++ container) and the camera HALv3 adapter
process in Chrome OS.
    
BUG=b:32690003
TEST=Make sure camera preview works in hangout.
TEST=unit tests

[jcliang, 2017-05-18 02:45:16]

jcliang@chromium.org changed reviewers:
+ wuchengli@chromium.org

[chfremer, 2017-05-18 17:24:39]

chfremer@chromium.org changed reviewers:
+ chfremer@chromium.org

[chfremer, 2017-05-18 17:24:39]

Just a quick drive-by question.

https://codereview.chromium.org/2878233002/diff/1/media/capture/video/video_c...
File media/capture/video/video_capture_device_unittest.cc (right):

https://codereview.chromium.org/2878233002/diff/1/media/capture/video/video_c...
media/capture/video/video_capture_device_unittest.cc:221: class
VideoCaptureDeviceTestEnvironment final : public testing::Environment {
Despite the name, this class does not seem to have anything specific to video
capture. Would it make sense to rename it to something like
"MojoEnabledTestEnvironment" and move it to some more general place, where it
can be reused by all tests that need to initialize Mojo?

[jcliang, 2017-06-12 16:58:15]

Description was changed from

==========
WIP: media: Add ArcCamera3Service Mojo proxy

BUG=b:36233258, b:32690003
TEST=Make sure camera preview works in hangout.
TEST=unit tests
==========

to

==========
media: add video capture device for ARC++ camera HAL v3
    
This CL adds VideoCaptureDevice and VideoCaptureDeviceFactory
for the ARC++ camera HAL v3. The VCD and VCD factory talk to
the HAL adapter process on Chrome OS throgh Mojo IPC to access
the camera service.
    
BUG=b:32690003
TEST=Make sure camera preview works in hangout.
TEST=unit tests
==========

[jcliang, 2017-06-12 16:59:12]

Description was changed from

==========
media: add video capture device for ARC++ camera HAL v3
    
This CL adds VideoCaptureDevice and VideoCaptureDeviceFactory
for the ARC++ camera HAL v3. The VCD and VCD factory talk to
the HAL adapter process on Chrome OS throgh Mojo IPC to access
the camera service.
    
BUG=b:32690003
TEST=Make sure camera preview works in hangout.
TEST=unit tests
==========

to

==========
media: add ArcCamera3Service Mojo service
    
The ArcCamera3Service Mojo service serves as a proxy to establish the
connections between the camera clients (i.e. VideoCaptureDevice in Chrome
and cameraserver process in ARC++ container) and the camera HALv3 adapter
process in Chrome OS.
    
BUG=b:32690003
TEST=Make sure camera preview works in hangout.
TEST=unit tests
==========

[jcliang, 2017-06-20 02:35:54]

Moved to gerrit: https://chromium-review.googlesource.com/c/540956/