Preliminary implementation of Google-style dialogs in ash::internal::DialogFrameView

ui/gfx/insets.h

Index: ui/gfx/insets.h
diff --git a/ui/gfx/insets.h b/ui/gfx/insets.h
index 147d58fa2305227f518d51179df98eec6367500d..b681c0de4c85292bba832116ce40432fbed44d14 100644
--- a/ui/gfx/insets.h
+++ b/ui/gfx/insets.h
@@ -80,6 +80,10 @@ class UI_EXPORT Insets {
     return *this;
   }
 
+  Insets operator-() const {
+    return Insets(-top_, -left_, -bottom_, -right_);
+  }
+
   // Returns a string representation of the insets.
   std::string ToString() const;