Enable IMG_context_priority depending on availability

The config value from the config store can still be used to
override it.

Test: Enable gpu completion tracing, observe how SF preempts other
GPU drawing
Bug: 64674361

Change-Id: Id2f6f11019c2e6cae078fb9e64e3d9d72e42533c
diff --git a/services/surfaceflinger/RenderEngine/RenderEngine.h b/services/surfaceflinger/RenderEngine/RenderEngine.h
index f886919..737b1dd 100644
--- a/services/surfaceflinger/RenderEngine/RenderEngine.h
+++ b/services/surfaceflinger/RenderEngine/RenderEngine.h
@@ -66,6 +66,8 @@
                                         uint32_t* status) = 0;
     virtual void unbindFramebuffer(uint32_t texName, uint32_t fbName) = 0;
 
+    static bool overrideUseContextPriorityFromConfig(bool useContextPriority);
+
 protected:
     RenderEngine();