telemetry:Extend tough_pinch_zoom_cases benchmark
telemetry:Extend tough_pinch_zoom_cases benchmark

Based on crrev.com/1104593002

Adds pinch-out gestures and repeats 12 gestures to
reduce noise.

Note for perf sheriff - this CL changes how the smoothness.tough_pinch_zoom_cases benchmark, is measured and is expected to change (likely regress) the numbers. As this change should reduce noise in the benchmark, and gives us extra coverage (zoom out as well as zoom in), a regression due to this change should be OK.
BUG=

Review URL: https://codereview.chromium.org/1350793002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#349453}

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