Introduce 'url::Origin'.

url/origin.cc

Index: url/origin.cc
diff --git a/url/origin.cc b/url/origin.cc
new file mode 100644
index 0000000000000000000000000000000000000000..96af38bbb0eab1e25ee6ac1fdb7dd20094bc609b
--- /dev/null
+++ b/url/origin.cc
@@ -0,0 +1,71 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "url/origin.h"
+
+#include <string.h>
+
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "url/gurl.h"
+#include "url/url_canon.h"
+#include "url/url_canon_stdstring.h"
+#include "url/url_constants.h"
+#include "url/url_util.h"
+
+namespace url {
+
+Origin::Origin() : unique_(true) {
+}
+
+Origin::Origin(const GURL& url) : unique_(true) {
+  if (!url.is_valid() || (!url.IsStandard() && !url.SchemeIsBlob()))
+      return;
+
+  if (url.SchemeIsFileSystem()) {
+    tuple_ = url::SchemeHostPort(*url.inner_url());
+  } else if (url.SchemeIsBlob()) {
+    // TODO(mkwst): This relies on the fact that GURL pushes the unparseable
+    // bits and pieces of a non-standard scheme into the GURL's path. It seems
+    // fairly fragile, so it might be worth teaching GURL about blobs' data in
+    // the same way we've taught it about filesystems' inner URLs.
+    //
+    // Alternatively, we could just do what the URL spec says, which boils down
+    // to parsing the URL after stripping off the scheme.

[Ryan Sleevi, 2015/07/10 11:59:53]

something something "we" in comments.

But more importantly, this doesn't seem to be an "Alternatively", since it seems
to be restating the last sentence of the first part of this comment ("so it
might be worth ...")

[Mike West, 2015/07/17 09:58:09]

Something something I (we!) still think that's a terrible idea.
Dropped it.

+    tuple_ = url::SchemeHostPort(GURL(url.path()));
+  } else {
+    tuple_ = url::SchemeHostPort(url);
+  }
+
+  unique_ = tuple_.IsInvalid();
+}
+
+Origin::~Origin() {
+}
+
+std::string Origin::Serialize() const {
+  if (unique())
+    return "null";
+
+  if (scheme() == kFileScheme)
+    return "file://";
+
+  return tuple_.Serialize();
+}
+
+bool Origin::IsSameOriginWith(const Origin& other) const {
+  if (unique_ || other.unique_)
+    return false;
+
+  return tuple_.Equals(other.tuple_);
+}
+
+bool Origin::operator<(const Origin& other) const {
+  return tuple_ < other.tuple_;
+}
+bool Origin::operator>(const Origin& other) const {
+  return tuple_ > other.tuple_;
+}
+
+}  // namespace url