MacViews: Implement Force Touch/Mac dictionary lookup for Textfields.

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 4f814c2ecadca305a569b7986ff72ee931df6838..43f8a387dd54f127d70b6e4dde69523af02b5be9 100644
--- a/ui/gfx/native_widget_types.h
+++ b/ui/gfx/native_widget_types.h
@@ -8,6 +8,7 @@
 #include <stdint.h>
 
 #include "base/logging.h"
+#include "base/strings/string16.h"
 #include "build/build_config.h"
 
 #if defined(OS_ANDROID)
@@ -80,6 +81,7 @@ struct CGContext;
 @class NSView;
 @class NSWindow;
 @class NSTextField;
+@class NSMutableAttributedString;
 #else
 class NSCursor;
 class NSEvent;
@@ -88,6 +90,7 @@ class NSImage;
 struct NSView;
 class NSWindow;
 class NSTextField;
+class NSMutableAttributedString;
 #endif  // __OBJC__
 #elif defined(OS_POSIX)
 typedef struct _cairo cairo_t;
@@ -215,6 +218,12 @@ const AcceleratedWidget kNullAcceleratedWidget = 0;
 #error unknown platform
 #endif
 
+#if defined(OS_MACOSX)
+typedef NSMutableAttributedString* NativeStyledString;
+#else
+typedef base::string16* NativeStyledString;
+#endif
+
 }  // namespace gfx
 
 #endif  // UI_GFX_NATIVE_WIDGET_TYPES_H_