Bit: support running all tests in a java package.

If a target name ends with a period, treat it as a package name
and run with "-e package" instead of "-e class".

Test: bit CtsProviderTestCases:android.provider.cts.contacts.

Change-Id: I3a9a0cbef76f57c46c41bf168b7e94eebecaf671
diff --git a/tools/bit/main.cpp b/tools/bit/main.cpp
index d056ba5..4c68b02 100644
--- a/tools/bit/main.cpp
+++ b/tools/bit/main.cpp
@@ -342,6 +342,10 @@
     fprintf(out, "      Builds and installs CtsProtoTestCases.apk, and runs the testWrite\n");
     fprintf(out, "      and testRepeated test methods on that class.\n");
     fprintf(out, "\n");
+    fprintf(out, "    bit CtsProtoTestCases:android.util.proto.cts.\n");
+    fprintf(out, "      Builds and installs CtsProtoTestCases.apk, and runs the tests in the java package\n");
+    fprintf(out, "      \"android.util.proto.cts\".\n");
+    fprintf(out, "\n");
     fprintf(out, "  Launching an Activity\n");
     fprintf(out, "  ---------------------\n");
     fprintf(out, "  To launch an activity, specify the activity class name after\n");