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Fast resize mode is set for web contents view every time tab dragging
status changes for both window source and dragged browser window. Which
was originally introduced as a performance optimization targeting
ChromeOS' tablet mode, where both windows bounds change during the
dragging session.

This causes issues such as crbug.com/1114767, where the source window
does not get correctly relaid out after a tab is dragged out of it into
a new browser window, particularly when that tab dragging session
started after a window resize or state change (eg: normal -> maximized).

That said, this patch fixes it by not setting "fast resize" on Linux
desktop builds. Where subtle bugs may happen, eg: tiling WMs not
honoring bounds requested, etc.

R=sky@chromium.org

Bug: 1114767
Change-Id: Ic33fd2471fe6ddbb05af650e724106c6600319d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346795Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#799640}