Support repurposing idle timer to work with kernel timer.

Idle timer would instead enable/disable hw vsyncs in accordance with
inactivity.

Bug: 130684082
Test: systrace
Change-Id: I289600fc41b7ded863c9486cf6c2ab6155b06550
diff --git a/services/surfaceflinger/SurfaceFlingerProperties.h b/services/surfaceflinger/SurfaceFlingerProperties.h
index 1864290..d772fa8 100644
--- a/services/surfaceflinger/SurfaceFlingerProperties.h
+++ b/services/surfaceflinger/SurfaceFlingerProperties.h
@@ -76,6 +76,8 @@
 
 bool enable_protected_contents(bool defaultValue);
 
+bool support_kernel_idle_timer(bool defaultValue);
+
 android::ui::DisplayPrimaries getDisplayNativePrimaries();
 } // namespace sysprop
 } // namespace android