cros: Don't send duplicate UserSession mojo messages to ash

ui/gfx/image/image_skia.cc

Index: ui/gfx/image/image_skia.cc
diff --git a/ui/gfx/image/image_skia.cc b/ui/gfx/image/image_skia.cc
index 20349b4baf14c71cd7fd7200697b559abc4fcf84..1d0aac2716b887b19ed61206dca6d755c3bdecb3 100644
--- a/ui/gfx/image/image_skia.cc
+++ b/ui/gfx/image/image_skia.cc
@@ -358,6 +358,10 @@ bool ImageSkia::BackedBySameObjectAs(const gfx::ImageSkia& other) const {
   return storage_.get() == other.storage_.get();
 }
 
+bool ImageSkia::Equals(const gfx::ImageSkia& other) const {
+  return BackedBySameObjectAs(other);
+}
+
 void ImageSkia::AddRepresentation(const ImageSkiaRep& image_rep) {
   DCHECK(!image_rep.is_null());