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This is a reland of 02ee5e26

Original change's description:
> [Fuchsia] Add unittests for VideoCaptureDeviceFuchsia
>
> Added unittests of for VideoCaptureDeviceFuchsia with fake
> fuchsia.camera3.Device and fuchsia.camera3.Stream implementations.
>
> In the future the fakes can be used for web_engine_integration_tests.
>
> Bug: 866669
> Change-Id: I0b5b0267127f9843b12123eb9e9a61890ec95a25
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2181184
> Reviewed-by: Emircan Uysaler <emircan@chromium.org>
> Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
> Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#768422}

TBR=kmarshall@chromium.org

Bug: 866669
Change-Id: I6c68aee7c50b8e3dc93744446042920c79c37db9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2200000Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768524}