chrome/blink: Add functionality for in-product help for media elements.

chrome/renderer/media/media_iph_impl.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 CHROME_RENDERER_MEDIA_MEDIA_IPH_IMPL_H_
+#define CHROME_RENDERER_MEDIA_MEDIA_IPH_IMPL_H_
+
+#include "base/memory/weak_ptr.h"
+#include "chrome/common/media_iph.mojom.h"
+#include "services/service_manager/public/cpp/bind_source_info.h"
+#include "third_party/WebKit/public/web/WebMediaIPH.h"
+
+namespace content {
+class RenderFrame;
+}  // namespace content
+
+class MediaIPHImpl : public blink::WebMediaIPH {
+ public:
+  explicit MediaIPHImpl(content::RenderFrame* render_frame);
+  ~MediaIPHImpl() override;
+
+  // blink::WebMediaIPH implementation.
+  void BindToClient(blink::WebMediaIPHClient*) override;
+  void ShowMediaDownloadIPH(const blink::WebRect&) override;
+  void HideMediaDownloadIPH() override;
+
+ private:
+  class MediaIPHDelegateService;
+
+  void CreateDelegateService(
+      const service_manager::BindSourceInfo& source_info,
+      chrome::mojom::MediaIPHDelegateServiceRequest request);
+  void IPHWidgetDismissed();
+
+  content::RenderFrame* render_frame_;
+  bool iph_active_ = false;
+  blink::WebMediaIPHClient* client_ = nullptr;
+  base::WeakPtrFactory<MediaIPHImpl> weak_factory_;
+};
+
+#endif  // CHROME_RENDERER_MEDIA_MEDIA_IPH_IMPL_H_