HWUI: Finish frame callbacks before framecomplete callbacks

If returning early from a draw, there is a chance that the frame
complete callbacks can execute before the frame callbacks. To fix
this, explicitly wait on frame callbacks to complete.

Test: Enable blast and test split screen resize
Change-Id: Id0eabd4dacdccbf1ce774efaad51abae7c57d5ea

libs/hwui/renderthread/CanvasContext.cpp

@@ -465,6 +465,7 @@ void CanvasContext::draw() {
         mCurrentFrameInfo->addFlag(FrameInfoFlags::SkippedFrame);
         // Notify the callbacks, even if there's nothing to draw so they aren't waiting
         // indefinitely
+        waitOnFences();
         for (auto& func : mFrameCompleteCallbacks) {
             std::invoke(func, mFrameNumber);
         }