a step toward enforcing unique metrics log IDs

First of several change lists:
1. Add in the new proto (this CL)
2. Migrate the existing code over to the proto.
3. Remove MetricsConstants once it is unused.

Bug: 26442178
Change-Id: Ic24829246af8ec5b202e39a85960aac5cf336c33
diff --git a/proto/Android.mk b/proto/Android.mk
new file mode 100644
index 0000000..a13a780
--- /dev/null
+++ b/proto/Android.mk
@@ -0,0 +1,16 @@
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := framework-protos
+
+LOCAL_PROTOC_OPTIMIZE_TYPE := nano
+LOCAL_SRC_FILES:= $(call all-proto-files-under, src)
+LOCAL_JARJAR_RULES := $(LOCAL_PATH)/jarjar-rules.txt
+
+LOCAL_NO_STANDARD_LIBRARIES := true
+LOCAL_JAVA_LIBRARIES := core-oj core-libart
+
+LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk $(LOCAL_PATH)/jarjar-rules.txt
+
+include $(BUILD_STATIC_JAVA_LIBRARY)