Add support for generating jars from protos and add cacheinvalidation_java.

third_party/protobuf/protobuf.gyp

Index: third_party/protobuf/protobuf.gyp
diff --git a/third_party/protobuf/protobuf.gyp b/third_party/protobuf/protobuf.gyp
index 5aa2b4f6b278ee41ea34c014670e49c10ff6c58e..21239a8a2c64840f7ece54c4ad2a38884ccc79a8 100644
--- a/third_party/protobuf/protobuf.gyp
+++ b/third_party/protobuf/protobuf.gyp
@@ -142,6 +142,17 @@
         ],
       },
     },
+    {
+      'target_name': 'protobuf_lite_java',
+      'type' : 'none',
+      'all_dependent_settings': {
+        'variables': {
+          'input_jars_paths' : [
+            'javalib/protobuf-java-2.4.1-lite.jar',
+          ],
+        }
+      }
+    },
     # This is the full, heavy protobuf lib that's needed for c++ .proto's
     # that don't specify the LITE_RUNTIME option.  The protocol
     # compiler itself (protoc) falls into that category.