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The plugin receives scrolling requests directly through the UI from a
transparent overlaid div. In RTL mode, the scrolling origin of that div
moves to the top-right corner, unlike in LTR mode, in which the
scrolling origin is in the top-left corner. The plugin is unable to
lay out its content based on the UI direction, so it always sets the
content originating from the top-right.

Consequently, sometimes the content can be scrolled completely
offscreen and some parts of the content cannot be scrolled to at all.

The plugin should ideally align content to the top-right corner in RTL
mode. For now, force the UI direction of #scroller to LTR so scrolling
of the content can originate in the top-left corner, consistent with the
expectations of the plugin.

Bug: 1158670
Change-Id: Id86798d61dc22e5f7bf0a3d79a04922ea71f5181
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592689
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Auto-Submit: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837200}