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

third_party/WebKit/Source/modules/media_controls/MediaDownloadInProductHelpManager.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 MediaDownloadInProductHelpManager_h
+#define MediaDownloadInProductHelpManager_h
+
+#include <memory>
+
+#include "modules/ModulesExport.h"
+#include "platform/heap/GarbageCollected.h"
+#include "platform/heap/Heap.h"
+#include "platform/heap/Member.h"
+#include "public/platform/media_download_in_product_help.mojom-blink.h"
+
+namespace blink {
+class MediaControlsImpl;
+
+class MODULES_EXPORT MediaDownloadInProductHelpManager final
+    : public GarbageCollectedFinalized<MediaDownloadInProductHelpManager> {
+  WTF_MAKE_NONCOPYABLE(MediaDownloadInProductHelpManager);
+
+ public:
+  MediaDownloadInProductHelpManager(MediaControlsImpl&);
+  virtual ~MediaDownloadInProductHelpManager();
+
+  void SetControlsState(bool can_show);
+  void SetDownloadButtonState(bool can_show);
+  void SetPlayState(bool is_playing);
+  bool IsShowingInProductHelp() const;
+
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  void StateUpdated();
+  bool CanShowInProductHelp() const;
+  void MaybeDispatchDownloadInProductHelpTrigger();
+  void DismissInProductHelp();
+
+  Member<MediaControlsImpl> controls_;
+
+  bool controls_can_show_ = false;
+  bool button_can_show_ = false;
+  bool is_playing_ = false;
+  bool media_download_in_product_trigger_observed_ = false;
+
+  std::unique_ptr<mojom::blink::MediaDownloadInProductHelpPtr>
+      media_in_product_help_;
+};
+
+}  // namespace blink
+
+#endif  // MediaDownloadInProductHelpManager_h