Support to enable profiling dynamically.

* Add an additonal reserved method setHALInstrumentation to
  enable/disable instrumentation during the hal execution.

Test: make hidl-gen
Change-Id: Iaf20e3f798a51b111bffd2e7294973bce0cabf9e
diff --git a/Interface.h b/Interface.h
index 6cde462..0182818 100644
--- a/Interface.h
+++ b/Interface.h
@@ -113,6 +113,7 @@
     Method *createSyspropsChangedMethod() const;
     Method *createLinkToDeathMethod() const;
     Method *createUnlinkToDeathMethod() const;
+    Method *createSetHALInstrumentationMethod() const;
 
     DISALLOW_COPY_AND_ASSIGN(Interface);
 };