Fix missing imports.

Author: Luke Sneeringer

pubsub/.coveragerc

@@ -6,6 +6,9 @@ source =
   tests.unit
 
 [report]
+omit =
+  */gapic/*
+  */proto/*
 show_missing = True
 
 exclude_lines =

pubsub/google/cloud/pubsub_v1/gapic/publisher_client.py

@@ -29,6 +29,7 @@
 import google.api_core.gapic_v1.config
 import google.api_core.gapic_v1.method
 import google.api_core.grpc_helpers
+import google.api_core.page_iterator
 import google.api_core.path_template
 
 from google.cloud.pubsub_v1.gapic import publisher_client_config

pubsub/google/cloud/pubsub_v1/gapic/subscriber_client.py

@@ -29,6 +29,7 @@
 import google.api_core.gapic_v1.config
 import google.api_core.gapic_v1.method
 import google.api_core.grpc_helpers
+import google.api_core.page_iterator
 import google.api_core.path_template
 import google.api_core.protobuf_helpers