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..b42961741d98defaf79e7d6fa126dfde47dd170c 100644
--- a/ui/display/types/display_mode.h
+++ b/ui/display/types/display_mode.h
@@ -26,7 +26,8 @@ class DISPLAY_TYPES_EXPORT DisplayMode {
   const gfx::Size& size() const { return size_; }
   bool is_interlaced() const { return is_interlaced_; }
   float refresh_rate() const { return refresh_rate_; }
-
+  bool operator==(const DisplayMode& other) const;

[kylechar, 2017/02/14 21:35:28]

https://google.github.io/styleguide/cppguide.html#Declaration_Order

nit: Personal preference but the style guide says "group similar declarations
together". So I would either put the operators before any non
constructor/destructor public methods or after all non-operator public methods
others. Mixing user defined methods and operators isn't ideal.

[thanhph1, 2017/02/15 15:37:56]

Done.

+  bool operator!=(const DisplayMode& other) const;
   virtual std::string ToString() const;
 
  private: