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GpuSurfaceTracker has been removed from all other desktop platforms (in
crrev.com/389975) and is not used on Mac. Remove it.

Include Mac in GPU_SURFACE_HANDLE_IS_ACCELERATED_WINDOW with other
desktop platforms.

Define gfx::AcceleratedWidget to be uint64_t instead of NSView*. It
never actually was NSView*, but was rather a sequence number used to
look up a ui::AcceleratedWidgetMac.

Fix a number of locations that were dangerously mixing NSView* and
gfx::AcceleratedWidget (now that they are incompatible types, this is
a compile error).

Bug: 772576
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I29212236627c512ed6a7fe55a8cf3e613e4e593a
Reviewed-on: https://chromium-review.googlesource.com/792295
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521030}