Check in protobuf java code and generate lite jar.

third_party/protobuf/java/src/test/java/com/google/protobuf/nested_extension.proto

Index: third_party/protobuf/java/src/test/java/com/google/protobuf/nested_extension.proto
diff --git a/third_party/protobuf/src/google/protobuf/unittest_lite_imports_nonlite.proto b/third_party/protobuf/java/src/test/java/com/google/protobuf/nested_extension.proto
similarity index 82%
copy from third_party/protobuf/src/google/protobuf/unittest_lite_imports_nonlite.proto
copy to third_party/protobuf/java/src/test/java/com/google/protobuf/nested_extension.proto
index d52cb8cc36d8924a3454f9170f6b338f14a59c5c..9fe5d560c9690fe5c2d4212c7911f97a74122b42 100644
--- a/third_party/protobuf/src/google/protobuf/unittest_lite_imports_nonlite.proto
+++ b/third_party/protobuf/java/src/test/java/com/google/protobuf/nested_extension.proto
@@ -28,16 +28,18 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: kenton@google.com (Kenton Varda)
+// Author: Darick Tong (darick@google.com)
 //
-// Tests that a "lite" message can import a regular message.
+// A proto file with nested extensions. Note that this must be defined in
+// a separate file to properly test the initialization of the outer class.
 
-package protobuf_unittest;
 
-import "google/protobuf/unittest.proto";
+import "com/google/protobuf/non_nested_extension.proto";
 
-option optimize_for = LITE_RUNTIME;
+package protobuf_unittest;
 
-message TestLiteImportsNonlite {
-  optional TestAllTypes message = 1;
+message MyNestedExtension {
+  extend MessageToBeExtended {
+    optional MessageToBeExtended recursiveExtension = 2;
+  }
 }