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The platform_window target is used from multiple components and should
therefore be a component itself. This is needed to avoid ODR violations.

One ODR problem that currently can happen is the duplication of the
global boolean backing UseTestConfigForPlatformWindows().

Reland with fuchsia_dbg fixes.

Bug: 1019015

Change-Id: I6781667889b45ce178d5a5aaa95807d6b0eb94e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891457Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711059}