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

content/renderer/presentation/test_presentation_connection.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_PRESENTATION_PRESENTATION_CONNECTION_TEST_HELPER_H_
 #define CONTENT_RENDERER_PRESENTATION_PRESENTATION_CONNECTION_TEST_HELPER_H_
 
 #include <memory>
 
 #include "testing/gmock/include/gmock/gmock.h"
 #include "third_party/WebKit/public/platform/modules/presentation/WebPresentationConnection.h"
 
 namespace content {
 
 class TestPresentationConnection : public blink::WebPresentationConnection {
  public:
   TestPresentationConnection();
   ~TestPresentationConnection();
 
   void bindProxy(
       std::unique_ptr<blink::WebPresentationConnectionProxy> proxy) override;
 
   MOCK_METHOD1(didReceiveTextMessage, void(const blink::WebString& message));
   MOCK_METHOD2(didReceiveBinaryMessage,
                void(const uint8_t* data, size_t length));
   MOCK_METHOD1(didChangeState, void(blink::WebPresentationConnectionState));
+  MOCK_METHOD0(didClose, void());
 
   blink::WebPresentationConnectionProxy* proxy();
 
  private:
   std::unique_ptr<blink::WebPresentationConnectionProxy> proxy_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PRESENTATION_PRESENTATION_CONNECTION_TEST_HELPER_H_