WIP - allow vector icons to specify motion.

ui/gfx/vector_icon_types.h

Index: ui/gfx/vector_icon_types.h
diff --git a/ui/gfx/vector_icon_types.h b/ui/gfx/vector_icon_types.h
index e8217e6ae36970d1ee399674e0ec19c6f99e6c1f..f2282f107e5f2d7eb94b22e421da328e0d4933fb 100644
--- a/ui/gfx/vector_icon_types.h
+++ b/ui/gfx/vector_icon_types.h
@@ -58,17 +58,21 @@ enum CommandType {
   // Flips the x-axis in RTL locales. Default is false, this command sets it to
   // true.
   FLIPS_IN_RTL,
+  // FIXME
+  TRANSITION_FROM,
+  TRANSITION_TO,
+  TRANSITION_END,
   // Marks the end of the list of commands.
   END
 };
 
 // A POD that describes either a path command or an argument for it.
 struct PathElement {
-  constexpr PathElement(CommandType value) : type(value) {}
+  constexpr PathElement(CommandType value) : command(value) {}
   constexpr PathElement(SkScalar value) : arg(value) {}
 
   union {
-    CommandType type;
+    CommandType command;
     SkScalar arg;
   };
 };