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diff --git a/widget/cocoa/VibrancyManager.h b/widget/cocoa/VibrancyManager.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef VibrancyManager_h
+#define VibrancyManager_h
+
+#include "mozilla/Assertions.h"
+#include "nsClassHashtable.h"
+#include "nsRegion.h"
+#include "nsTArray.h"
+#include "ViewRegion.h"
+
+#import <Foundation/NSGeometry.h>
+
+@class NSColor;
+@class NSView;
+class nsChildView;
+
+namespace mozilla {
+
+enum class VibrancyType {
+  LIGHT,
+  DARK,
+  TOOLTIP,
+  MENU,
+  HIGHLIGHTED_MENUITEM,
+  SHEET,
+  SOURCE_LIST,
+  SOURCE_LIST_SELECTION,
+  ACTIVE_SOURCE_LIST_SELECTION
+};
+
+/**
+ * VibrancyManager takes care of updating the vibrant regions of a window.
+ * Vibrancy is a visual look that was introduced on OS X starting with 10.10.
+ * An app declares vibrant window regions to the window server, and the window
+ * server will display a blurred rendering of the screen contents from behind
+ * the window in these areas, behind the actual window contents. Consequently,
+ * the effect is only visible in areas where the window contents are not
+ * completely opaque. Usually this is achieved by clearing the background of
+ * the window prior to drawing in the vibrant areas. This is possible even if
+ * the window is declared as opaque.
+ */
+class VibrancyManager {
+public:
+  /**
+   * Create a new VibrancyManager instance and provide it with an NSView
+   * to attach NSVisualEffectViews to.
+   *
+   * @param aCoordinateConverter  The nsChildView to use for converting
+   *   nsIntRect device pixel coordinates into Cocoa NSRect coordinates. Must
+   *   outlive this VibrancyManager instance.
+   * @param aContainerView  The view that's going to be the superview of the
+   *   NSVisualEffectViews which will be created for vibrant regions.
+   */
+  VibrancyManager(const nsChildView& aCoordinateConverter,
+                  NSView* aContainerView)
+    : mCoordinateConverter(aCoordinateConverter)
+    , mContainerView(aContainerView)
+  {
+    MOZ_ASSERT(SystemSupportsVibrancy(),
+               "Don't instantiate this if !SystemSupportsVibrancy()");
+  }
+
+  /**
+   * Update the placement of the NSVisualEffectViews inside the container
+   * NSView so that they cover aRegion, and create new NSVisualEffectViews
+   * or remove existing ones as needed.
+   * @param aType   The vibrancy type to use in the region.
+   * @param aRegion The vibrant area, in device pixels.
+   */
+  void UpdateVibrantRegion(VibrancyType aType,
+                           const LayoutDeviceIntRegion& aRegion);
+
+  bool HasVibrantRegions() { return !mVibrantRegions.IsEmpty(); }
+
+  /**
+   * Clear the vibrant areas that we know about.
+   * The clearing happens in the current NSGraphicsContext. If you call this
+   * from within an -[NSView drawRect:] implementation, the currrent
+   * NSGraphicsContext is already correctly set to the window drawing context.
+   */
+  void ClearVibrantAreas() const;
+
+  /**
+   * Return the fill color that should be drawn on top of the cleared window
+   * parts. Usually this would be drawn by -[NSVisualEffectView drawRect:].
+   * The returned color is opaque if the system-wide "Reduce transparency"
+   * preference is set.
+   */
+  NSColor* VibrancyFillColorForType(VibrancyType aType);
+
+  /**
+   * Return the font smoothing background color that should be used for text
+   * drawn on top of the vibrant window parts.
+   */
+  NSColor* VibrancyFontSmoothingBackgroundColorForType(VibrancyType aType);
+
+  /**
+   * Check whether the operating system supports vibrancy at all.
+   * You may only create a VibrancyManager instance if this returns true.
+   * @return Whether VibrancyManager can be used on this OS.
+   */
+  static bool SystemSupportsVibrancy();
+
+protected:
+  void ClearVibrantRegion(const LayoutDeviceIntRegion& aVibrantRegion) const;
+  NSView* CreateEffectView(VibrancyType aType);
+
+  const nsChildView& mCoordinateConverter;
+  NSView* mContainerView;
+  nsClassHashtable<nsUint32HashKey, ViewRegion> mVibrantRegions;
+};
+
+} // namespace mozilla
+
+#endif // VibrancyManager_h