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This CL adds new benchmark to run drag gestures on gmail and maps page.
These pages are moved from top_25_smooth page set since this is desktop
specific. Please refer to crrev.com/985603003 and crrev.com/955653003
for motivation.

BUG=457148
BUG=464685

Review URL: https://codereview.chromium.org/1037483004

Cr-Commit-Position: refs/heads/master@{#322557}