GitLab

Add histograms for tab dragging in clamshell mode.

Bug: 1032766
Change-Id: I33b9a39598ff06aa2c343a86e5e2effa79523d46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199501
Commit-Queue: Yichen Zhou <yichenz@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769943}