ServiceWorker: Scope should match url in longest-prefix-match way (won't commit)

content/browser/service_worker/service_worker_utils.cc

Index: content/browser/service_worker/service_worker_utils.cc
diff --git a/content/browser/service_worker/service_worker_utils.cc b/content/browser/service_worker/service_worker_utils.cc
index 165bcbec563e8226494083450aedad1f7a90c9c8..917980514d559e5416baf4a969c66f3feec71918 100644
--- a/content/browser/service_worker/service_worker_utils.cc
+++ b/content/browser/service_worker/service_worker_utils.cc
@@ -4,9 +4,12 @@
 
 #include "content/browser/service_worker/service_worker_utils.h"
 
+#include <string>
+
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "content/public/common/content_switches.h"
+#include "url/gurl.h"
 
 namespace content {
 
@@ -30,4 +33,21 @@ bool ServiceWorkerUtils::ScopeMatches(const GURL& scope, const GURL& url) {
   return scope_spec == url_spec;
 }
 
+bool ServiceWorkerUtils::FindLongestScopeMatch(
+    const std::vector<GURL>& scopes, const GURL& url, size_t* pos) {
+  DCHECK(!url.has_ref());
+  DCHECK(pos);
+
+  bool found = false;
+  for (size_t i = 0; i < scopes.size(); ++i) {
+    if (!ScopeMatches(scopes[i], url))
+      continue;
+    if (!found || scopes.at(*pos) < scopes.at(i)) {
+      *pos = i;
+      found = true;
+    }
+  }
+  return found;
+}
+
 }  // namespace content