mac: Handle hidpi cursors.

webkit/glue/webcursor.h

 // Copyright (c) 2012 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 WEBKIT_GLUE_WEBCURSOR_H_
 #define WEBKIT_GLUE_WEBCURSOR_H_
 
 #include "base/basictypes.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
@@ skipping 116 matching lines @@
 
   void SetCustomData(const WebKit::WebImage& image);
   void ImageFromCustomData(WebKit::WebImage* image) const;
 
   // Clamp the hotspot to the custom image's bounds, if this is a custom cursor.
   void ClampHotspot();
 
   // WebCore::PlatformCursor type.
   int type_;
 
-  // Hot spot in cursor image in physical image coordinate space.
+  // Hotspot in cursor image in pixels.
   gfx::Point hotspot_;
 
   // Custom cursor data, as 32-bit RGBA.
   // Platform-inspecific because it can be serialized.
-  gfx::Size custom_size_;
+  gfx::Size custom_size_;  // In pixels.
   float custom_scale_;
   std::vector<char> custom_data_;
 
 #if defined(OS_WIN)
   // An externally generated HCURSOR. We assume that it remains valid, i.e we
   // don't attempt to copy the HCURSOR.
   HCURSOR external_cursor_;
 #endif
 
 #if defined(USE_AURA) && defined(USE_X11)
   // Only used for custom cursors.
   ui::PlatformCursor platform_cursor_;
   float device_scale_factor_;
 #elif defined(OS_WIN)
   // A custom cursor created from custom bitmap data by Webkit.
   HCURSOR custom_cursor_;
 #elif defined(TOOLKIT_GTK)
   // A custom cursor created that should be unref'ed from the destructor.
   GdkCursor* unref_;
 #endif
 };
 
 #endif  // WEBKIT_GLUE_WEBCURSOR_H_