Implemented stub ShareService mojo service, for navigator.share.

chrome/browser/webshare/share_service_impl.h

Index: chrome/browser/webshare/share_service_impl.h
diff --git a/chrome/browser/webshare/share_service_impl.h b/chrome/browser/webshare/share_service_impl.h
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+++ b/chrome/browser/webshare/share_service_impl.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 CHROME_BROWSER_WEBSHARE_SHARE_SERVICE_IMPL_H_
+#define CHROME_BROWSER_WEBSHARE_SHARE_SERVICE_IMPL_H_
+
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "third_party/WebKit/public/platform/modules/webshare/webshare.mojom.h"
+#include "url/gurl.h"
+
+// Desktop implementation of the ShareService Mojo service.
+class ShareServiceImpl : public blink::mojom::ShareService {
+ public:
+  explicit ShareServiceImpl(blink::mojom::ShareServiceRequest request);
+  ~ShareServiceImpl() override;
+
+  static void Create(mojo::InterfaceRequest<ShareService> request);
+
+  void Share(const std::string& title,
+             const std::string& text,
+             const GURL& url,
+             const ShareCallback& callback) override;
+
+ private:
+  mojo::Binding<blink::mojom::ShareService> binding_;
+};
+
+#endif  // CHROME_BROWSER_WEBSHARE_SHARE_SERVICE_IMPL_H_