ART: Add event callback support

Add basic event callback support infrastructure. Actual users will
follow.

Bug: 31684920
Test: m test-art-host
Change-Id: Ic496933ef3a94f9d27a2779b7f4fdc5b096eab22
diff --git a/runtime/openjdkjvmti/Android.bp b/runtime/openjdkjvmti/Android.bp
index d7a6c0a..e1f9ba2 100644
--- a/runtime/openjdkjvmti/Android.bp
+++ b/runtime/openjdkjvmti/Android.bp
@@ -17,7 +17,8 @@
     name: "libopenjdkjvmti_defaults",
     defaults: ["art_defaults"],
     host_supported: true,
-    srcs: ["OpenjdkJvmTi.cc",
+    srcs: ["events.cc",
+           "OpenjdkJvmTi.cc",
            "transform.cc"],
     include_dirs: ["art/runtime"],
     shared_libs: [