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

content/renderer/presentation/test_presentation_connection.h

Index: content/renderer/presentation/test_presentation_connection.h
diff --git a/content/renderer/presentation/test_presentation_connection.h b/content/renderer/presentation/test_presentation_connection.h
index b7518b68870014c6f4cd644b15f86ae697dc1388..cd327fdc549919e03ed23d9baf18d1fe0aa3f74e 100644
--- a/content/renderer/presentation/test_presentation_connection.h
+++ b/content/renderer/presentation/test_presentation_connection.h
@@ -10,6 +10,11 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "third_party/WebKit/public/platform/modules/presentation/WebPresentationConnection.h"
 
+namespace blink {
+enum class WebPresentationConnectionCloseReason;
+class WebString;
+}
+
 namespace content {
 
 class TestPresentationConnection : public blink::WebPresentationConnection {
@@ -24,6 +29,9 @@ class TestPresentationConnection : public blink::WebPresentationConnection {
   MOCK_METHOD2(didReceiveBinaryMessage,
                void(const uint8_t* data, size_t length));
   MOCK_METHOD1(didChangeState, void(blink::WebPresentationConnectionState));
+  MOCK_METHOD2(didClose,
+               void(blink::WebPresentationConnectionCloseReason,
+                    const blink::WebString& message));
 
   blink::WebPresentationConnectionProxy* proxy();