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This is a reland of ec54e1ca

Original change's description:
> Adapt scroll-visual-viewport-send-boundary-events.html to run with a compositor
> 
> Since this test uses chrome.gpuBenchmarking.pinchBy, we need to have
> it run with a compositor. As part of issue 787924, we will no longer
> handle gesture pinch events on the main thread.
> 
> Bug: 787924
> Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
> Change-Id: I0127028f246ae72a772ef8c9f163b4403b6c3036
> Reviewed-on: https://chromium-review.googlesource.com/1068625
> Commit-Queue: Kevin McNee <mcnee@chromium.org>
> Reviewed-by: Ella Ge <eirage@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#560831}

Bug: 787924
Change-Id: I1d662bb8855ac32226cfd149c58b80d318e9adb7
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Reviewed-on: https://chromium-review.googlesource.com/1071807Reviewed-by: Kevin McNee <mcnee@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561536}