[Presentation API] Add layout test for connection.close() and fix test failures

third_party/WebKit/public/platform/modules/presentation/WebPresentationConnection.h

Index: third_party/WebKit/public/platform/modules/presentation/WebPresentationConnection.h
diff --git a/third_party/WebKit/public/platform/modules/presentation/WebPresentationConnection.h b/third_party/WebKit/public/platform/modules/presentation/WebPresentationConnection.h
index 69460de80b6baf0124042483b213550eb067ed7a..d67b05f2749a8c99e81224debe098d5e3caeb54e 100644
--- a/third_party/WebKit/public/platform/modules/presentation/WebPresentationConnection.h
+++ b/third_party/WebKit/public/platform/modules/presentation/WebPresentationConnection.h
@@ -30,6 +30,10 @@ class WebPresentationConnection {
 
   // Notifies the connection about its state change.
   virtual void didChangeState(WebPresentationConnectionState) = 0;
+
+  // Notifies the connection about its state change to 'closed' with "Closed"
+  // reason.
+  virtual void didClose() = 0;
 };
 
 }  // namespace blink