ui/gfx: Add ToString() function to Point class.

webkit/plugins/npapi/webplugin_delegate_impl_mac.mm

Index: webkit/plugins/npapi/webplugin_delegate_impl_mac.mm
diff --git a/webkit/plugins/npapi/webplugin_delegate_impl_mac.mm b/webkit/plugins/npapi/webplugin_delegate_impl_mac.mm
index 5de0b594b376365f345e1a637b4c44a98582f168..835cf0a1b97683151d3a9e7bd6023c1509534d0d 100644
--- a/webkit/plugins/npapi/webplugin_delegate_impl_mac.mm
+++ b/webkit/plugins/npapi/webplugin_delegate_impl_mac.mm
@@ -513,8 +513,8 @@ bool WebPluginDelegateImpl::PlatformHandleInputEvent(
     if (content_origin.x() != content_area_origin_.x() ||
         content_origin.y() != content_area_origin_.y()) {
       DLOG(WARNING) << "Stale plugin content area location: "
-                    << content_area_origin_ << " instead of "
-                    << content_origin;
+                    << content_area_origin_.ToString() << " instead of "
+                    << content_origin.ToString();
       SetContentAreaOrigin(content_origin);
     }