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 6200eacdc927776483d775562db11cce284cc7e0)
3 files changed