SF: Decouple MessageQueue

Define an ICompositor interface against which MessageQueue (which ought
to be an implementation detail of Scheduler) is implemented. Change the
equivocal invalidate/refresh nomenclature to commit/composite. Schedule
sampling only after composite.

Bug: 185535769
Test: libsurfaceflinger_unittest
Change-Id: I0c18f312459bae48531449f24f7b53c104fc5812
diff --git a/services/surfaceflinger/RefreshRateOverlay.cpp b/services/surfaceflinger/RefreshRateOverlay.cpp
index ec81e63..2502d66 100644
--- a/services/surfaceflinger/RefreshRateOverlay.cpp
+++ b/services/surfaceflinger/RefreshRateOverlay.cpp
@@ -284,7 +284,7 @@
     t.apply();
 }
 
-void RefreshRateOverlay::onInvalidate() {
+void RefreshRateOverlay::animate() {
     if (!mCurrentFps.has_value()) return;
 
     const auto& buffers = getOrCreateBuffers(*mCurrentFps);