Make Synthetic gesture have precise scroll granularity

Synthetic scroll gestures in web tests have kScrollByPrecisePixel granularity by default [1].
Making it so Synthetic gestures from the devtools protocol also have kScrollByPrecisePixel granularity by default. These functions are called by third party libraries like catapult [2].
This ensures that these tests' don't have their functionality or expectations altered by Percent based scrolling (kWindowsScrollingPersonality) which can cause them to fail if enabled. (continuation of [3])


[1] https://source.chromium.org/chromium/chromium/src/+/main:content/renderer/gpu_benchmarking_extension.cc;l=777?q=gpu_benchmarking_extension.cc
[2] https://chromium.googlesource.com/catapult/+/refs/heads/main/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py#370
[3] https://crrev.com/c/2553869

Change-Id: I4ebefddf5948b9299b01b26aaab278d09075775c
Bug: 1330006
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3846599
Reviewed-by: Danil Somsikov <dsv@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Gaston Rodriguez <gastonr@microsoft.com>
Reviewed-by: Olga Gerchikov <gerchiko@microsoft.com>
Reviewed-by: Rahul Arakeri <arakeri@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1044107}