Adds link disambiguation popup support to Windows.

chrome/browser/ui/views/link_disambiguation/link_disambiguation_popup.h

+// Copyright (c) 2014 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_LINK_DISAMBIGUATION_LINK_DISAMBIGUATION_POPUP_H_
+#define CHROME_BROWSER_UI_VIEWS_LINK_DISAMBIGUATION_LINK_DISAMBIGUATION_POPUP_H_
+
+#include "base/callback_forward.h"
+#include "content/public/browser/web_contents_view_delegate.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace aura {
+class Window;
+}
+
+// Creates a popup with a zoomed bitmap rendered by Blink of an area in web
+// |content| that received an ambiguous Gesture event. This allows the user to
+// select which of the links their first Gesture event overlapped. The popup
+// generates a new Gesture event which is sent back to the provided |callback|.
+class LinkDisambiguationPopup {
+ public:
+  LinkDisambiguationPopup();
+  ~LinkDisambiguationPopup();
+
+  // Creates and shows the Popup. |zoomed_bitmap| is the scaled-up image of the
+  // ambiguous web content. |target_rect| is the original, unzoomed rectangle
+  // in DIPs in the coordinate system of |content|. We will convert received
+  // gestures in the popup to the coordinate system of |content| and as an
+  // offset within |target_rect|, and then call the |callback| with the
+  // transformed coordinates GestureEvent.
+  void Show(const SkBitmap& zoomed_bitmap,
+            const gfx::Rect& target_rect,
+            const gfx::NativeView content,
+            const content::WebContentsViewDelegate::GestureCallback& callback);
+  void Close();
+
+ private:
+  class ZoomBubbleView;
+
+  // It is possible that |view_| can be destroyed by its widget instead of
+  // closed explicitly by us. In that case we need to be notified that it has
+  // been destroyed so we can invalidate our own pointer to that view.
+  void InvalidateBubbleView();
+
+  const aura::Window* content_;

[sky, 2014/08/04 20:05:19]

Add description.

[luken, 2014/09/11 01:07:26]

Done.

+  ZoomBubbleView* view_;
+
+  DISALLOW_COPY_AND_ASSIGN(LinkDisambiguationPopup);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_LINK_DISAMBIGUATION_LINK_DISAMBIGUATION_POPUP_H_