Factor ExclusiveAccessView out to SubtleNotificationView.

chrome/browser/ui/views/subtle_notification_view.h

+// 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_UI_VIEWS_SUBTLE_NOTIFICATION_VIEW_H_
+#define CHROME_BROWSER_UI_VIEWS_SUBTLE_NOTIFICATION_VIEW_H_
+
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "ui/gfx/native_widget_types.h"
+#include "ui/views/view.h"
+
+namespace views {
+class Link;
+class LinkListener;
+class Widget;
+}
+
+// A transient, transparent notification bubble that appears at the top of the
+// browser window to give the user a short instruction (e.g., "Press Esc to exit
+// full screen"). Unlike a full notification, a subtle notification
+// auto-dismisses after a short period of time. It also has special
+// functionality for displaying keyboard shortcuts (rendering the keys inside a
+// rounded rectangle).
+class SubtleNotificationView : public views::View {
+ public:
+  SubtleNotificationView(const base::string16& instruction_text,
+                         const base::string16& link_text,
+                         views::LinkListener* link_listener);
+  ~SubtleNotificationView() override;
+
+  void UpdateContent(const base::string16& instruction_text,
+                     const base::string16& link_text);
+
+  // Creates a Widget containing a SubtleNotificationView. If |accept_events|,
+  // the bubble will block mouse events (required if there is a clickable link);

[msw, 2016/05/18 18:38:32]

nit: s/block/handle/

[Matt Giuca, 2016/05/19 01:50:32]

Intercept (compromise). I was trying to get across the idea that mouse events
won't go on to the underlying surface.

+  // if not, events will go through to the underlying window.
+  static views::Widget* CreatePopupWidget(gfx::NativeView parent_view,
+                                          SubtleNotificationView* view,
+                                          bool accept_events);
+
+ private:
+  class InstructionView;
+
+  // Clickable hint text for exiting fullscreen mode. (Non-simplified mode

[msw, 2016/05/18 18:38:32]

nit: remove "for exiting fullscreen mode"?

[Matt Giuca, 2016/05/19 01:50:32]

Done.

+  // only.)
+  views::Link* link_;
+  // Instruction for exiting fullscreen / mouse lock. Only present if there is

[msw, 2016/05/18 18:38:32]

nit: remove "for exiting fullscreen / mouse lock"?

[Matt Giuca, 2016/05/19 01:50:32]

Done.

+  // no link (always present in simplified mode).
+  InstructionView* exit_instruction_;

[msw, 2016/05/18 18:38:32]

nit: rename |instruction_view_| or similar (not exit related)?

[Matt Giuca, 2016/05/19 01:50:32]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(SubtleNotificationView);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_SUBTLE_NOTIFICATION_VIEW_H_