aura-x11: Add custom web cursor support.

ui/gfx/native_widget_types.h

Index: ui/gfx/native_widget_types.h
diff --git a/ui/gfx/native_widget_types.h b/ui/gfx/native_widget_types.h
index 307e141a376fd071c084a8454a4f40a47f760fcb..16cf377cd3247da44bfae5cfca16aeb107618588 100644
--- a/ui/gfx/native_widget_types.h
+++ b/ui/gfx/native_widget_types.h
@@ -43,6 +43,8 @@
 // 'views'.
 
 #if defined(USE_AURA)
+#include "ui/aura/cursor.h"
+
 class SkRegion;
 namespace aura {
 class Event;
@@ -104,8 +106,7 @@ class AcceleratedSurface;
 namespace gfx {
 
 #if defined(USE_AURA)
-// See ui/aura/cursor.h for values.
-typedef int NativeCursor;
+typedef aura::Cursor NativeCursor;
 typedef aura::Window* NativeView;
 typedef aura::Window* NativeWindow;
 typedef SkRegion* NativeRegion;
@@ -182,7 +183,11 @@ typedef void* NativeViewAccessible;
 #endif
 
 // A constant value to indicate that gfx::NativeCursor refers to no cursor.
+#if defined(USE_AURA)
+const int kNullCursor = 0;
+#else
 const gfx::NativeCursor kNullCursor = static_cast<gfx::NativeCursor>(NULL);
+#endif
 
 #if defined(OS_MACOSX)
 typedef NSImage NativeImageType;