Moves HeaderView into it's own .h/.cc

ash/common/frame/header_view.h

Index: ash/common/frame/header_view.h
diff --git a/ash/common/frame/header_view.h b/ash/common/frame/header_view.h
new file mode 100644
index 0000000000000000000000000000000000000000..5a56ee5b323a883b24081dae9f50c58ef67157b4
--- /dev/null
+++ b/ash/common/frame/header_view.h
@@ -0,0 +1,107 @@
+// 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 ASH_COMMON_FRAME_HEADER_VIEW_H_
+#define ASH_COMMON_FRAME_HEADER_VIEW_H_
+
+#include <memory>
+
+#include "ash/ash_export.h"
+#include "ash/common/shell_observer.h"
+#include "ash/common/wm/immersive/wm_immersive_fullscreen_controller_delegate.h"
+#include "base/macros.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/views/view.h"
+
+namespace views {
+class ImageView;
+class Widget;
+}
+
+namespace ash {
+
+class DefaultHeaderPainter;
+class FrameCaptionButtonContainerView;
+
+// View which paints the frame header (title, caption buttons...). It slides off
+// and on screen in immersive fullscreen.
+class ASH_EXPORT HeaderView : public views::View,
+                              public WmImmersiveFullscreenControllerDelegate,
+                              public ShellObserver {
+ public:
+  // |target_widget| is the widget that the caption buttons act on.
+  // |target_widget| is not necessarily the same as the widget the header is
+  // placed in. For example, in immersive fullscreen this view may be painted in
+  // a widget that slides in and out on top of the main app or browser window.
+  // However, clicking a caption button should act on the target widget.
+  explicit HeaderView(views::Widget* target_widget);
+  ~HeaderView() override;
+
+  // Schedules a repaint for the entire title.
+  void SchedulePaintForTitle();
+
+  // Tells the window controls to reset themselves to the normal state.
+  void ResetWindowControls();
+
+  // Returns the amount of the view's pixels which should be on screen.
+  int GetPreferredOnScreenHeight() const;
+
+  // Returns the view's preferred height.
+  int GetPreferredHeight() const;
+
+  // Returns the view's minimum width.
+  int GetMinimumWidth() const;
+
+  void UpdateAvatarIcon();
+
+  void SizeConstraintsChanged();
+
+  void SetFrameColors(SkColor active_frame_color, SkColor inactive_frame_color);
+
+  // views::View:
+  void Layout() override;
+  void OnPaint(gfx::Canvas* canvas) override;
+  void ChildPreferredSizeChanged(views::View* child) override;
+
+  // ShellObserver:
+  void OnOverviewModeStarting() override;
+  void OnOverviewModeEnded() override;
+  void OnMaximizeModeStarted() override;
+  void OnMaximizeModeEnded() override;
+
+  FrameCaptionButtonContainerView* caption_button_container() {
+    return caption_button_container_;
+  }
+
+  views::View* avatar_icon() const;
+
+ private:
+  // WmImmersiveFullscreenControllerDelegate:
+  void OnImmersiveRevealStarted() override;
+  void OnImmersiveRevealEnded() override;
+  void OnImmersiveFullscreenExited() override;
+  void SetVisibleFraction(double visible_fraction) override;
+  std::vector<gfx::Rect> GetVisibleBoundsInScreen() const override;
+
+  // The widget that the caption buttons act on.
+  views::Widget* target_widget_;
+
+  // Helper for painting the header.
+  std::unique_ptr<DefaultHeaderPainter> header_painter_;
+
+  views::ImageView* avatar_icon_;
+
+  // View which contains the window caption buttons.
+  FrameCaptionButtonContainerView* caption_button_container_;
+
+  // The fraction of the header's height which is visible while in fullscreen.
+  // This value is meaningless when not in fullscreen.
+  double fullscreen_visible_fraction_;
+
+  DISALLOW_COPY_AND_ASSIGN(HeaderView);
+};
+
+}  // namespace ash
+
+#endif  // ASH_COMMON_FRAME_HEADER_VIEW_H_