Show ChromeVox caption panel when spoken feedback is enabled.

chrome/browser/chromeos/accessibility/chromevox_panel.h

+// Copyright 2015 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_CHROMEOS_ACCESSIBILITY_CHROMEVOX_PANEL_H_
+#define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_CHROMEVOX_PANEL_H_
+
+#include "base/macros.h"
+#include "ui/gfx/display_observer.h"
+#include "ui/views/widget/widget_delegate.h"
+
+class ChromeVoxPanelWebContentsObserver;
+class Profile;
+
+namespace views {
+class Widget;
+}
+
+class ChromeVoxPanel : public views::WidgetDelegate,
+                       public gfx::DisplayObserver {
+ public:
+  explicit ChromeVoxPanel(Profile* profile);
+  ~ChromeVoxPanel() override;
+
+  int GetHeight();
+  aura::Window* GetRootWindow();
+
+  void Close();
+  void OnDeviceScaleFactorChanged(float device_scale_factor);
+  void DidFirstVisuallyNonEmptyPaint();
+  void EnterFullscreen();
+  void ExitFullscreen();
+
+  // WidgetDelegate overrides.
+  const views::Widget* GetWidget() const override;
+  views::Widget* GetWidget() override;
+  void DeleteDelegate() override;
+
+  // DisplayObserver overrides;
+  void OnDisplayAdded(const gfx::Display& new_display) override {}
+  void OnDisplayRemoved(const gfx::Display& old_display) override {}
+  void OnDisplayMetricsChanged(const gfx::Display& display,
+                               uint32_t changed_metrics) override;
+
+ private:
+  void UpdateWidgetBounds();
+
+  Profile* profile_;
+  views::Widget* widget_;
+  aura::Window* root_window_;
+  scoped_ptr<ChromeVoxPanelWebContentsObserver> web_contents_observer_;
+  bool fullscreen_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeVoxPanel);
+};
+
+#endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_CHROMEVOX_PANEL_H_