Add project field to iam pubsub topic resources (#1154)

* Add project field to iam pubsub topic resources

* Update documentation

google/iam_pubsub_topic.go

@@ -15,6 +15,12 @@ var IamPubsubTopicSchema = map[string]*schema.Schema{
 		ForceNew:         true,
 		DiffSuppressFunc: compareSelfLinkOrResourceName,
 	},
+	"project": &schema.Schema{
+		Type:     schema.TypeString,
+		Optional: true,
+		Computed: true,
+		ForceNew: true,
+	},
 }
 
 type PubsubTopicIamUpdater struct {

google/resource_pubsub_topic_iam_test.go

@@ -139,13 +139,14 @@ resource "google_service_account" "test-account-1" {
 }
 
 resource "google_pubsub_topic_iam_binding" "foo" {
+  project = "%s"
   topic   = "${google_pubsub_topic.topic.name}"
   role    = "roles/pubsub.publisher"
   members = [
     "serviceAccount:${google_service_account.test-account-1.email}",
   ]
 }
-`, topic, account)
+`, topic, account, getTestProjectFromEnv())
 }
 
 func testAccPubsubTopicIamBinding_update(topic, account string) string {

website/docs/r/pubsub_topic_iam.html.markdown

@@ -64,6 +64,9 @@ The following arguments are supported:
 
 * `topic` - (Required) The topic name or id to bind to attach IAM policy to.
 
+* `project` - (Optional) The project in which the resource belongs. If it
+    is not provided, the provider project is used.
+
 * `member/members` - (Required) Identities that will be granted the privilege in `role`.
   Each entry can have one of the following values:
   * **allUsers**: A special identifier that represents anyone who is on the internet; with or without a Google account.