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Pointer Capture in Exo was initially implemented by using SetCapture()
on the aura::Window. This delegates all input events (touch, keyboard,
mouse, etc.) to the capture window, meaning that the user will not be
able to interact with anything outside the window with any form of
input.

Rather than relying on SetCapture(), we set a pre-target handler that
receives and consumes all mouse events when pointer capture is enabled.

  exo_unittests

Bug: b/146164376
Test: manual testing on ARC++ P using ArcPointerCaptureTestApp.apk;
Change-Id: I99bcda823ce662e39a91920af98ae09d715bbc38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1966007
Auto-Submit: Prabir Pradhan <prabirmsp@chromium.org>
Commit-Queue: Prabir Pradhan <prabirmsp@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729404}