Bug 626602, part 7: Copy the impl of < and <= from nsIntSize to gfxIntSize. Sigh. sr=roc

gfx/thebes/gfxPoint.h

@@ -60,6 +60,13 @@ struct THEBES_API gfxIntSize {
     int operator!=(const gfxIntSize& s) const {
         return ((width != s.width) || (height != s.height));
     }
+    bool operator<(const gfxIntSize& s) const {
+        return (operator<=(s) &&
+                (width < s.width || height < s.height));
+    }
+    bool operator<=(const gfxIntSize& s) const {
+        return (width <= s.width) && (height <= s.height);
+    }
     gfxIntSize operator+(const gfxIntSize& s) const {
         return gfxIntSize(width + s.width, height + s.height);
     }