c356c1c20540047359611ee544300bb903c2fe97
Synchronization is needed,to make sure, read() is not called by hwcVsyncThread when VSYNC is disabled. Otherwise in usecases, where display is OFF, and still some tasks keep running in the background; SurfaceFlinger hogs CPU. (cherry picked from commit ffa84468bbd2517ffb22ab4023cb57a6272fc80d) Change-Id: Idd779647a27ed3e6fb0703a07033dd5f7cd1b5fd
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