Add migration code to change existing domain scoped content settings to be origin scoped

components/content_settings/core/common/content_settings_pattern.h

Index: components/content_settings/core/common/content_settings_pattern.h
diff --git a/components/content_settings/core/common/content_settings_pattern.h b/components/content_settings/core/common/content_settings_pattern.h
index f85c648bfc036aa9ac0261d0aa3cb62ed0d5318f..13468ce483b89dfd5c0601fdac476f6fbe1be5ad 100644
--- a/components/content_settings/core/common/content_settings_pattern.h
+++ b/components/content_settings/core/common/content_settings_pattern.h
@@ -145,6 +145,9 @@ class ContentSettingsPattern {
   //   - [a:b:c:d:e:f:g:h] (matches an exact IPv6 ip)
   static ContentSettingsPattern FromString(const std::string& pattern_spec);
 
+  static ContentSettingsPattern FromDomainToOrigin(
+      const ContentSettingsPattern domain_pattern);
+
   // Sets the scheme that doesn't support domain wildcard and port.
   // Needs to be called by the embedder before using ContentSettingsPattern.
   // |scheme| can't be NULL, and the pointed string must remain alive until the
@@ -167,6 +170,9 @@ class ContentSettingsPattern {
   // True if this pattern matches all hosts (i.e. it has a host wildcard).
   bool MatchesAllHosts() const;
 
+  // True if this pattern is generated from FromURL().
+  bool IsGeneratedFromURLDomainScoped() const;
+
   // Returns a std::string representation of this pattern.
   std::string ToString() const;