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ApplyViewportDeltas and RecordWheelAndTouchScrollingCount have been using a raw pointer type
for the argument. It would be good if we can use const T& for the arguments if possible.

Bug: None
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ibdcbc5cd3ebe95cce743b2ffcc84b7dc009a0044
Reviewed-on: https://chromium-review.googlesource.com/1227861Reviewed-by: Ali Juma <ajuma@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung.kim@lge.com>
Cr-Commit-Position: refs/heads/master@{#592020}