GitLab

This is a reland of I7946d7acab334bffdf2bb49a1d9c424cf46fc610 and
the following bug fixes as follows;
"viz: Fix wrong uv_rect calculation" 4bf9d01d
"viz: add unittests for CL:1291590" f8dfbe74

Additional fix:
- Fix the flickering issue because of primary |uv_rect| cropping even though
an overlay attemption fails mainly due to limited pixel rate (e.g. 4k video).
- Fix wrong |uv_rect| calculation which causes atomic page flip failures with
"No space left on device (28)" error.

Original change's description:
> viz: Turn off or crop primary plane when possible
>
> For many fullscreen cases, the rest of the renderpass quads are solid
> black quads. In that case, we can turn off the primary plane, and not
> having to scan out an full screen of black pixels saves a good deal of
> power. In other cases, we can crop down the primary plane down to the
> content rectangle (youtube channel logo, for example) and save power.
>
> Averaging battery draw measurement over about a minute of play back
> for a fullscreen youtube video, power savings for soraka is around
> 500mW (6.5W to 6.0W) and 300mW for kevin (4.4W to 4.1W), when we
> turn off the primary plane.
>
> Change-Id: I7946d7acab334bffdf2bb49a1d9c424cf46fc610
> Reviewed-on: https://chromium-review.googlesource.com/c/1045256
> Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
> Reviewed-by: Dongseong Hwang <dongseong.hwang@intel.com>
> Commit-Queue: Kristian H. Kristensen <hoegsberg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#600415}

TEST=SingleOverlayOnTopTest.AllowVideoNormalTransformWithOutputSurfaceOverlay

Bug: 896945, 900373
Change-Id: I88db118dbc3ca2fed8c8eaf1f9a4337cdae12990
Reviewed-on: https://chromium-review.googlesource.com/c/1346997
Commit-Queue: Dongseong Hwang <dongseong.hwang@intel.com>
Reviewed-by: Dongseong Hwang <dongseong.hwang@intel.com>
Reviewed-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611484}