Add ota_metadata_proto_java

Test: th
Change-Id: Iac9b679299db6a23cdf85d7c46f20d0538ba6015
diff --git a/tools/releasetools/ota_metadata.proto b/tools/releasetools/ota_metadata.proto
index 7aaca6f..ed9d0c3 100644
--- a/tools/releasetools/ota_metadata.proto
+++ b/tools/releasetools/ota_metadata.proto
@@ -23,6 +23,8 @@
 
 package build.tools.releasetools;
 option optimize_for = LITE_RUNTIME;
+option java_package = "android.ota";
+option java_outer_classname = "OtaPackageMetadata";
 
 // The build information of a particular partition on the device.
 message PartitionState {