pubsub java: make publish and pull package-private (#241)

google/pubsub/v1/pubsub_gapic.yaml

@@ -29,6 +29,8 @@ collection_oneofs:
   - deleted_topic
 interfaces:
 - name: google.pubsub.v1.Subscriber
+  lang_doc:
+    java: To retrieve messages from a subscription, see the Subscriber class.
   collections:
   - name_pattern: projects/{project}
     entity_name: project
@@ -186,6 +188,10 @@ interfaces:
     field_name_patterns:
       subscription: subscription
     timeout_millis: 60000
+    surface_treatments:
+    - include_languages:
+      - java
+      visibility: PACKAGE
   - name: StreamingPull
     required_fields:
     - subscription
@@ -199,6 +205,10 @@ interfaces:
     field_name_patterns:
       subscription: subscription
     timeout_millis: 60000
+    surface_treatments:
+    - include_languages:
+      - java
+      visibility: PACKAGE
   - name: ModifyPushConfig
     flattening:
       groups:
@@ -274,6 +284,8 @@ interfaces:
       - go
       visibility: DISABLED
 - name: google.pubsub.v1.Publisher
+  lang_doc:
+    java: To publish messages to a topic, see the Publisher class.
   smoke_test:
     method: CreateTopic
     init_fields:
@@ -363,6 +375,10 @@ interfaces:
     sample_code_init_fields:
     - messages[0].data
     timeout_millis: 60000
+    surface_treatments:
+    - include_languages:
+      - java
+      visibility: PACKAGE
   - name: GetTopic
     flattening:
       groups: