LockAgent: Add crasher binary

Add a helper that crashes with a given message.

Test: manual
Change-Id: I77e249484e65e7532045d0f8cc53ceb18d94bff5
diff --git a/tools/lock_agent/Android.bp b/tools/lock_agent/Android.bp
index c54e5b5..2125ad6 100644
--- a/tools/lock_agent/Android.bp
+++ b/tools/lock_agent/Android.bp
@@ -51,11 +51,22 @@
     installable: true,
 }
 
+cc_binary {
+    name: "lockagent_crasher",
+    srcs: ["crasher.cpp"],
+    static_libs: ["libbase_ndk"],
+    shared_libs: ["liblog"],
+    sdk_version: "current",
+    stl: "c++_static",
+    compile_multilib: "first",
+}
+
 sh_binary {
     name: "start_with_lockagent",
     src: "start_with_lockagent.sh",
     required: [
         "liblockagent",
         "lockagent",
+        "lockagent_crasher",
     ],
 }