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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}