Flip IsBackedBySurfaceTexture to IsBackedBySurfaceView

For legacy overlay path video can be overlaid only when it's already
in the SurfaceView. Right now we gate overlay code paths on
IsBackedBySurfaceTexture which is the opposite, but it's set to false
by default. This requires additional checks if the video was hardware
decoded (i.e the only code path where the bool set, so we don't rely
on default value).

This CL flips logic the opposite way, so we handle only videos that
are in SurfaceView and don't need extra is_stream_video checks.

This change is no-op.

Bug: 396584155
Change-Id: I7003cdd9f46ccc27fefff59285d76b4eec03a63f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6310820
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: Saifuddin Hitawala <hitawala@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1428464}