Return Visible Touch Handle height for RWHVA::GetTouchHandleHeight

ShowSelectionMenu queries for TouchHandle height while passing this
information to Java for positioning the Floating Popup Menu. Only
Start Handle height is being queried at all times. During an active
selection, it is possible Start Handle is hidden but End handle is
only visible. In these cases, Start handle height would be zero.
So, return end handle height in these cases.

Bug: 851346
Change-Id: I087d12d95b86abfc1068d4fb9f331837912ca7a9
Reviewed-on: https://chromium-review.googlesource.com/1094818
Commit-Queue: AJITH KUMAR V <ajith.v@samsung.com>
Reviewed-by: AJITH KUMAR V <ajith.v@samsung.com>
Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566355}
4 files changed