Write mojom and StructTraits for DisplaySnapshot.

ui/display/types/display_mode.h

Index: ui/display/types/display_mode.h
diff --git a/ui/display/types/display_mode.h b/ui/display/types/display_mode.h
index 0b972d5f497a8288007c0d154c74ca982964f31f..ef849dddbbcaddad4abc06d29a0bafa34e97a678 100644
--- a/ui/display/types/display_mode.h
+++ b/ui/display/types/display_mode.h
@@ -21,6 +21,8 @@ class DISPLAY_TYPES_EXPORT DisplayMode {
  public:
   DisplayMode(const gfx::Size& size, bool interlaced, float refresh_rate);
   virtual ~DisplayMode();
+  bool operator==(const DisplayMode& other) const;

[rjkroege, 2017/02/17 03:03:51]

Why do you need this? I'd prefer that it would be unnecessary.

[thanhph1, 2017/02/21 16:52:17]

I removed this and added back a helper function in files
display_struct_traits_unittest.cc and display_snapshot_mojo_struct_traits.cc.

+  bool operator!=(const DisplayMode& other) const;
   virtual std::unique_ptr<DisplayMode> Clone() const;
 
   const gfx::Size& size() const { return size_; }