Add url::Origin::GetURL() to convert Origins to URLs without reparsing

url/origin.cc

Index: url/origin.cc
diff --git a/url/origin.cc b/url/origin.cc
index a14c8918d35bfbf4430d0d5c5d7ebee577639f95..008e5ec97ad3e08115ed210d7d10ff8090d3a141 100644
--- a/url/origin.cc
+++ b/url/origin.cc
@@ -65,6 +65,16 @@ std::string Origin::Serialize() const {
   return tuple_.Serialize();
 }
 
+GURL Origin::GetURL() const {
+  if (unique())
+    return GURL();
+
+  if (scheme() == kFileScheme)
+    return GURL("file://");

[brettw, 2016/09/30 20:18:48]

1. We should have a constant for this so we don't duplicate it here and above.

2. I think we want to pick something else. GURL will canonicalize this to
"file:///" which means the root directory (the way to read that is it's got
"://" like http does, then a path of "/"). If we want the root directory, then
we should probably change both of these to "file:///".

[Charlie Harrison, 2016/10/03 17:28:47]

Done.

+
+  return tuple_.GetURL();
+}
+
 bool Origin::IsSameOriginWith(const Origin& other) const {
   if (unique_ || other.unique_)
     return false;