Revert 170319 - Removed dead code from chrome/browser/extensions/api/declarative

Reverting because this code will be used in the future (it is currently behind a #ifdef check).


BUG=161992


Review URL: https://chromiumcodereview.appspot.com/11412247

TBR=sergiyb@google.com
Review URL: https://codereview.chromium.org/11316307

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170757 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/extensions/api/declarative/rules_registry_with_cache.cc

@@ -20,6 +20,10 @@ RulesRegistryWithCache::RulesRegistryWithCache(Delegate* delegate)
     : delegate_(delegate) {
 }
 
+void RulesRegistryWithCache::AddReadyCallback(const base::Closure& callback) {
+  ready_callbacks_.push_back(callback);
+}
+
 void RulesRegistryWithCache::OnReady() {
   for (size_t i = 0; i < ready_callbacks_.size(); ++i)
     ready_callbacks_[i].Run();

chrome/browser/extensions/api/declarative/rules_registry_with_cache.h

@@ -36,6 +36,14 @@ class RulesRegistryWithCache : public RulesRegistry {
 
   explicit RulesRegistryWithCache(Delegate* delegate);
 
+  // Returns true if we are ready to process rules.
+  bool IsReady() {
+    return !delegate_.get() || delegate_->IsReady();
+  }
+
+  // Add a callback to call when we transition to Ready.
+  void AddReadyCallback(const base::Closure& callback);
+
   // Called by our delegate when we are ready. This is called exactly once,
   // if we have a delegate.
   void OnReady();