Adds link disambiguation popup support to Windows.

content/public/browser/web_contents_view_delegate.h

Index: content/public/browser/web_contents_view_delegate.h
diff --git a/content/public/browser/web_contents_view_delegate.h b/content/public/browser/web_contents_view_delegate.h
index 5a859b2230fd81f80df2814b3efc6a881435f1e9..fa41b9a69ee645d53b9a90ace7316504fbedafd4 100644
--- a/content/public/browser/web_contents_view_delegate.h
+++ b/content/public/browser/web_contents_view_delegate.h
@@ -9,7 +9,10 @@
 #import <Cocoa/Cocoa.h>
 #endif
 
+#include "base/callback.h"
 #include "content/common/content_export.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/native_widget_types.h"
 
 #if defined(__OBJC__)
 @protocol RenderWidgetHostViewMacDelegate;
@@ -19,6 +22,11 @@ namespace gfx {
 class Size;
 }
 
+namespace ui {
+class GestureEvent;
+class MouseEvent;
+}
+
 namespace content {
 class RenderFrameHost;
 class RenderWidgetHost;
@@ -47,6 +55,26 @@ class CONTENT_EXPORT WebContentsViewDelegate {
   virtual void TakeFocus(bool reverse);
   virtual void SizeChanged(const gfx::Size& size);
 
+#if defined(TOOLKIT_VIEWS)
+  // Shows a popup window containing the |zoomed_bitmap| of web content with
+  // more than one link, allowing the user to more easily select which link
+  // they were trying to touch. |target_rect| is the rectangle in DIPs in the
+  // coordinate system of |content| that has been scaled up in |zoomed_bitmap|.
+  // Should the popup receive any gesture events they should be translated back
+  // to the coordinate system of |content| and then provided to the |callback|
+  // for forwarding on to the original scale web content.
+  virtual void ShowDisambiguationPopup(
+      const gfx::Rect& target_rect,
+      const SkBitmap& zoomed_bitmap,
+      const gfx::NativeView content,
+      const base::Callback<void(ui::GestureEvent*)>& gesture_cb,
+      const base::Callback<void(ui::MouseEvent*)>& mouse_cb) = 0;
+
+  // Hides the link disambiguation popup window if it is showing, otherwise does
+  // nothing.
+  virtual void HideDisambiguationPopup() = 0;
+#endif
+
   // Returns a newly-created delegate for the RenderWidgetHostViewMac, to handle
   // events on the responder chain.
 #if defined(__OBJC__)