Implement accessibility support for CSS-transformed iframes.

ui/gfx/ipc/gfx_param_traits.h

Index: ui/gfx/ipc/gfx_param_traits.h
diff --git a/ui/gfx/ipc/gfx_param_traits.h b/ui/gfx/ipc/gfx_param_traits.h
index e22d0a68c81d1c546c12e4f56563c90607ec32fa..17b501fa28664c83fc8cde7454a4643339375c14 100644
--- a/ui/gfx/ipc/gfx_param_traits.h
+++ b/ui/gfx/ipc/gfx_param_traits.h
@@ -29,6 +29,7 @@ class RectF;
 class ScrollOffset;
 class Size;
 class SizeF;
+class Transform;
 class Vector2d;
 class Vector2dF;
 }  // namespace gfx
@@ -162,6 +163,16 @@ struct GFX_IPC_EXPORT ParamTraits<gfx::ScrollOffset> {
   static void Log(const param_type& p, std::string* l);
 };
 
+template <>
+struct GFX_IPC_EXPORT ParamTraits<gfx::Transform> {
+  typedef gfx::Transform param_type;
+  static void Write(base::Pickle* m, const param_type& p);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 template <>
 struct GFX_IPC_EXPORT ParamTraits<gfx::ScopedRefCountedIOSurfaceMachPort> {