surfaceflinger: make vsync injection more robust
There are more issues than I expected :) - no lock to synchronize enable/disable and injection - Every time injection is diabled and enabled, a new EventThread is created - mCallback might be nullptr - ENABLE_VSYNC_INJECTIONS/INJECT_VSYNC should require special permission - MessageQueue::setEventThread must be called from the main thread - MessageQueue::setEventThread does not handle EventThread switch well Bug: 65483324 Test: manual Merged-In: I7d7b98d1f57afc64af0f2065a9bc7c8ad004ca9f Change-Id: I7d7b98d1f57afc64af0f2065a9bc7c8ad004ca9f (cherry picked from commit 6200eacd)
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