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On chrome/x11, right-clicking on the window decoration bar toggles a
context menu whose one of the menu items allows switching between
builtin and system/native window decorations.

Today, chrome/ozone/wayland crashes when building the menu because it tried to
read a preference only registered in use_x11: kUseCustomChromeFrame.

So this CL does two things:

- registers the preference [1] based on PlatformProperties in case of USE_OZONE.

- checks whether using system title bar[2] is supported by underlying ozone platform.
By default, ozone platforms have this feature disabled.

[1] kUseCustomChromeFrame
[2] IDC_USE_SYSTEM_TITLE_BAR

Based on tonikitoo@igalia.com's patch.

Bug: 578890, 849596
Change-Id: Ib05d2057f1193a9e41580d0133e35dff4bc2ea77
Reviewed-on: https://chromium-review.googlesource.com/1167045
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582087}