Declarative resource hints go through mojo IPC to //content

third_party/WebKit/Source/platform/testing/PlatformMojoMock.h

+// Copyright 2016 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 PlatformMojoMock_h
+#define PlatformMojoMock_h
+
+#include "platform/testing/TestingPlatformSupport.h"
+#include "platform/weborigin/KURL.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+namespace blink {
+
+class PlatformMojoMock final : public TestingPlatformSupport {
+public:
+    PlatformMojoMock() {}
+    ~PlatformMojoMock() override {}
+
+    MOCK_METHOD3(preconnect, void(const KURL& url, bool credentialsFlag, int numConnections));
+    MOCK_METHOD1(preresolve, void(const KURL& url));
+};
+
+} // namespace blink
+
+#endif // PlatformMojoMock_h