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Since owned_fd (and future 'owned' objects) have their own notion of
being null/invalid and are mutually exclusive of one another, there
is no need to keep a separate GpuFenceHandle "type" member variable.

To facilitate empty objects on some platforms, adjust the declaration
of needs_comma to avoid 'variable not used' warnings from the compiler.

Bug: 1131616
Change-Id: I2da1b719ac2770edcbf1f5e9c26b909004925170
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423164Reviewed-by: David Reveman <reveman@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#810039}