Reland "Change clip_name -> clip_path in VideoQualityTestFixture::Params::Video."

This is a reland of 184f6d5d75c198cb7b70b8f9b75e0b5096c6e577.

Incorrect build dependencies in downstream tests have been fixed,
and an initialization bug in this CL has also been fixed.

Original change's description:
> Change clip_name -> clip_path in VideoQualityTestFixture::Params::Video.
>
> This allows external users of this test fixture to specify a custom
> path, rather than just a custom file name.
>
> Bug: webrtc:10349
> Change-Id: I84e886c8bc28583017ce9ed7b9e7ee6a8e95730f
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/126227
> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
> Reviewed-by: Åsa Persson <asapersson@webrtc.org>
> Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#27033}

TBR: kwiberg@webrtc.org
Bug: webrtc:10349
Change-Id: I0ec9dd26cd96c3db8ac8482893a26e62a1b1eefc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/127181
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27102}
diff --git a/video/BUILD.gn b/video/BUILD.gn
index 72a0803..ec6003c 100644
--- a/video/BUILD.gn
+++ b/video/BUILD.gn
@@ -308,6 +308,7 @@
       "../rtc_base/experiments:alr_experiment",
       "../system_wrappers:field_trial",
       "../test:field_trial",
+      "../test:fileutils",
       "../test:test_common",
       "../test:test_support",
       "//testing/gtest",