Added Web Share (navigator.share) experimental web API (stub).

third_party/WebKit/Source/modules/webshare/NavigatorShare.h

Index: third_party/WebKit/Source/modules/webshare/NavigatorShare.h
diff --git a/third_party/WebKit/Source/modules/webshare/NavigatorShare.h b/third_party/WebKit/Source/modules/webshare/NavigatorShare.h
new file mode 100644
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+++ b/third_party/WebKit/Source/modules/webshare/NavigatorShare.h
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+// 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 NavigatorShare_h
+#define NavigatorShare_h
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/ContextLifecycleObserver.h"
+#include "core/events/EventTarget.h"
+#include "platform/Supplementable.h"
+#include "platform/heap/Handle.h"
+#include "public/platform/modules/webshare/webshare.mojom-blink.h"
+#include "wtf/HashSet.h"
+
+namespace blink {
+
+class Navigator;
+
+class NavigatorShare final : public GarbageCollectedFinalized<NavigatorShare>, public Supplement<Navigator> {
+    USING_GARBAGE_COLLECTED_MIXIN(NavigatorShare);
+public:
+    ~NavigatorShare();
+
+    // Gets, or creates, NavigatorShare supplement on Navigator.
+    // See platform/Supplementable.h
+    static NavigatorShare& from(Navigator&);
+
+    // Navigator partial interface
+    ScriptPromise share(ScriptState*, const String& title, const String& text);
+    static ScriptPromise share(ScriptState*, Navigator&, const String& title, const String& text);
+
+    DECLARE_TRACE();
+
+private:
+    class ShareClientImpl;
+
+    NavigatorShare();
+    static const char* supplementName();
+
+    blink::mojom::blink::ShareServicePtr m_service;
+
+    HeapHashSet<Member<ShareClientImpl>> m_clients;
+};
+
+} // namespace blink
+
+#endif // NavigatorShare_h