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Patchset 1 is the reverted CL as previously reviewed.
Patchset 2 is the fix.

The reason for the revert was a linker error for component builds.
The fix is to add a missing CONTENT_EXPORT.

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Original CL description:

The video capture service requires GPU dependencies to be injected after startup
in order to enable accelerated MJPEG decoding. This CL adds this injection call
where the service is started from the media_perception_private extension.

The injected dependencies use classes that used to live in
content/browser/renderer_host/media. To be able to reuse them for the
extension, this CL moves them to a location that is accessible to both
usage sites, i.e. to content/browser/gpu with a public interface in
content/public/browser.

TBR=jam@chromium.org

Bug: 877690
Change-Id: Ibeb29361c762d8366f1433d918e8abead0a39173
Reviewed-on: https://chromium-review.googlesource.com/1208821Reviewed-by: Christian Fremerey <chfremer@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589242}