Revert of Reland Compile under-invalidation checking in all builds

Revert of Reland Compile under-invalidation checking in all builds (patchset #4 id:60001 of https://codereview.chromium.org/2301303002/ )

Reason for revert:
This should be landed to discover under-invalidations. If any test hit this, we should mark the test fail instead of reverting this.

Original issue's description:
> Reland Compile under-invalidation checking in all builds
> 
> This relands https://codereview.chromium.org/2299223002 which was
> reverted because of random pixel under-invalidations.
> 
> Now clear the bitmaps before drawing the pictures.
> 
> BTW changed the error indication color from solid red to translucent
> magenta to distinguish from the normal red pixels in test results.
> 
> > This will let the tests having under-invalidation issues produce the
> > same result on all builds, so enable us to rebaseline the tests with
> > failure results. In this way we can track either regressions and
> > progressions instead of ignoring the tests.
> >
> > BUG=619103
> > CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
> >
> > Review-Url: https://codereview.chromium.org/2299223002
> > Cr-Commit-Position: refs/heads/master@{#416060}
> 
> BUG=619103
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
> R=pdr@chromium.org

TBR=pdr@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=619103

[Xianzhu, 2016-09-06 16:05:32]

Created Revert of Reland Compile under-invalidation checking in all builds

[Xianzhu, 2016-09-06 16:07:32]

On 2016/09/06 16:05:32, Xianzhu wrote:
> Created Revert of Reland Compile under-invalidation checking in all builds

This is wrong. We should not revert this. We should revert the revert of reland.