Create a mechanism define declarative rules via the extension manifest.

extensions/browser/api/declarative/rules_registry.h

Index: extensions/browser/api/declarative/rules_registry.h
diff --git a/extensions/browser/api/declarative/rules_registry.h b/extensions/browser/api/declarative/rules_registry.h
index 34ad7acfc8191ed0b54d42d50238965c2bc0a7fd..20495450f47664fb88aca89acab482fdb9e3193a 100644
--- a/extensions/browser/api/declarative/rules_registry.h
+++ b/extensions/browser/api/declarative/rules_registry.h
@@ -76,7 +76,8 @@ class RulesRegistry : public base::RefCountedThreadSafe<RulesRegistry> {
   // relevant are added or none.
   std::string AddRules(
       const std::string& extension_id,
-      const std::vector<linked_ptr<RulesRegistry::Rule> >& rules);
+      const std::vector<linked_ptr<RulesRegistry::Rule>>& rules,
+      bool from_manifest = false);

[not at google - send to devlin, 2015/06/04 22:00:51]

default parameters are against style guide

[danduong, 2015/06/04 23:06:37]

Done.

 
   // Unregisters all rules listed in |rule_identifiers| and owned by
   // |extension_id| from this RulesRegistry.
@@ -148,7 +149,8 @@ class RulesRegistry : public base::RefCountedThreadSafe<RulesRegistry> {
   // message otherwise.
   std::string AddRulesNoFill(
       const std::string& extension_id,
-      const std::vector<linked_ptr<RulesRegistry::Rule> >& rules);
+      const std::vector<linked_ptr<RulesRegistry::Rule>>& rules,
+      bool from_manifest);
 
   // These functions need to apply the rules to the browser, while the base
   // class will handle defaulting empty fields before calling *Impl, and will
@@ -171,6 +173,7 @@ class RulesRegistry : public base::RefCountedThreadSafe<RulesRegistry> {
   typedef std::pair<ExtensionId, RuleId> RulesDictionaryKey;
   typedef std::map<RulesDictionaryKey, linked_ptr<RulesRegistry::Rule> >
       RulesDictionary;
+  typedef std::set<RulesDictionaryKey> RuleIdSet;
   enum ProcessChangedRulesState {
     // ProcessChangedRules can never be called, |cache_delegate_| is NULL.
     NEVER_PROCESS,
@@ -222,6 +225,8 @@ class RulesRegistry : public base::RefCountedThreadSafe<RulesRegistry> {
 
   RulesDictionary rules_;
 
+  RuleIdSet manifest_rule_ids_;
+
   // Signaled when we have finished reading from storage for all extensions that
   // are loaded on startup.
   OneShotEvent ready_;