Add crash reporting to metrics_daemon.

BUG=none
TEST=unit tests,gmerge'd on device, verified it runs OK, pkill -SEGV generated minidump.

Review URL: http://codereview.chromium.org/2806043
diff --git a/metrics/Makefile b/metrics/Makefile
index 2986078..480da22 100644
--- a/metrics/Makefile
+++ b/metrics/Makefile
@@ -53,7 +53,7 @@
 	$(CXX) -o $@ $^ $(TESTCOUNTER_LIBS)
 
 $(DAEMON): $(DAEMON_OBJS) $(SHAREDLIB)
-	$(CXX) -o $@ $^ $(DAEMON_LDFLAGS)
+	$(CXX) -o $@ $^ $(DAEMON_LDFLAGS) -lcrash
 
 $(DAEMON_TEST): $(TESTDAEMON_OBJS)
 	$(CXX) -o $@ $^ $(DAEMON_LDFLAGS) $(TESTDAEMON_LIBS)