Added some missing java files to android_protobuf/BUILD.gn

Including these files is necessary in order to satisfy dependencies in
gvr-android-sdk.

BUG=389343

Review-Url: https://codereview.chromium.org/2235733003
Cr-Commit-Position: refs/heads/master@{#411112}

third_party/android_protobuf/BUILD.gn

@@ -150,6 +150,9 @@ if (is_android) {
   android_library("protobuf_nano_javalib") {
     chromium_code = false
     java_files = [
+      "src/java/src/device/main/java/com/google/protobuf/nano/android/ParcelableExtendableMessageNano.java",
+      "src/java/src/device/main/java/com/google/protobuf/nano/android/ParcelableMessageNano.java",
+      "src/java/src/device/main/java/com/google/protobuf/nano/android/ParcelableMessageNanoCreator.java",
       "src/java/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java",
       "src/java/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java",
       "src/java/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java",