Add WebNotificationTray

ash/system/tray/system_tray_bubble_view.h

+#ifndef ASH_SYSTEM_TRAY_SYSTEM_TRAY_BUBBLE_VIEW_H_
+#define ASH_SYSTEM_TRAY_SYSTEM_TRAY_BUBBLE_VIEW_H_
+#pragma once
+
+#include "ui/views/bubble/bubble_delegate.h"
+
+namespace views {
+class View;
+}
+
+namespace ash {
+namespace internal {
+
+// Specialized bubble view for system and web notification bubbles.
+// Mostly this handles custom anchor location and arrow and border rendering.
+class SystemTrayBubbleView : public views::BubbleDelegateView {
+ public:
+  class Host {
+   public:
+    Host() {}
+    virtual ~Host() {}
+
+    virtual void BubbleViewDestroyed() = 0;
+    virtual gfx::Rect GetAnchorRect() const = 0;
+    virtual void OnMouseEnteredView() = 0;
+    virtual void OnMoiseExitedView() = 0;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Host);
+  };
+
+  SystemTrayBubbleView(views::View* anchor,
+                       views::BubbleBorder::ArrowLocation arrow_location,
+                       Host* host,
+                       bool can_activate);
+  virtual ~SystemTrayBubbleView();
+
+  void SetBubbleBorder(int arrow_offset);
+  void UpdateAnchor();
+  void SetMaxHeight(int height);
+
+  // Called when the host is destroyed.
+  void reset_host() { host_ = NULL; }
+
+  void set_bubble_width(int width) { bubble_width_ = width; }
+
+ private:
+  // Overridden from views::BubbleDelegateView.
+  virtual void Init() OVERRIDE;
+  virtual gfx::Rect GetAnchorRect() OVERRIDE;
+  virtual bool CanActivate() const OVERRIDE;
+
+  // Overridden from views::View.
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual void OnMouseEntered(const views::MouseEvent& event) OVERRIDE;
+  virtual void OnMouseExited(const views::MouseEvent& event) OVERRIDE;
+  virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
+  virtual void ChildPreferredSizeChanged(View* child) OVERRIDE;
+  virtual void ViewHierarchyChanged(bool is_add,
+                                    views::View* parent,
+                                    views::View* child) OVERRIDE;
+
+  Host* host_;
+  bool can_activate_;
+  int max_height_;
+  int bubble_width_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemTrayBubbleView);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_BUBBLE_VIEW_H_