Implement declarativeContent API.

chrome/browser/extensions/extension_action.h

Index: chrome/browser/extensions/extension_action.h
diff --git a/chrome/browser/extensions/extension_action.h b/chrome/browser/extensions/extension_action.h
index 18684039a00b6d8508714d3a15ba934a5c815e28..95fae5a69a44a6e2522738617be5d29367c42a7c 100644
--- a/chrome/browser/extensions/extension_action.h
+++ b/chrome/browser/extensions/extension_action.h
@@ -220,15 +220,22 @@ class ExtensionAction {
   // care of any appropriate transition animations.  Returns true if
   // the appearance has changed.
   bool SetAppearance(int tab_id, Appearance value);
+  // The declarative appearance overrides a default appearance but is overrided
+  // by an appearance set directly on the tab.
+  void SetDeclarativeAppearance(int tab_id, Appearance value);
+  void ClearDeclarativeAppearance(int tab_id);
+
   // Get the badge visibility for a tab, or the default badge visibility
   // if none was set.
   bool GetIsVisible(int tab_id) const {
-    return GetValue(&appearance_, tab_id) != INVISIBLE;
+    return GetDeclarativeValue(&appearance_, &declarative_appearance_, tab_id)
+        != INVISIBLE;
   }
 
   // True if the tab's action wants the user's attention.
   bool WantsAttention(int tab_id) const {
-    return GetValue(&appearance_, tab_id) == WANTS_ATTENTION;
+    return GetDeclarativeValue(&appearance_, &declarative_appearance_, tab_id)
+        == WANTS_ATTENTION;
   }
 
   // Remove all tab-specific state.
@@ -283,6 +290,30 @@ class ExtensionAction {
     }
   }
 
+  // Returns the first of map[tab_id], declarative_map[tab_id],
+  // map[kDefaultTabId], or ValueTraits<T>::CreateEmpty() that's defined.  Don't
+  // return this result to an extension's background page because the
+  // declarative state can leak information about hosts the extension doesn't
+  // have permission to access.
+  template<class T>
+  T GetDeclarativeValue(const std::map<int, T>* map,
+                        const std::map<int, T>* declarative_map,
+                        int tab_id) const {
+    typename std::map<int, T>::const_iterator iter = map->find(tab_id);
+    if (iter != map->end())
+      return iter->second;
+
+    iter = declarative_map->find(tab_id);
+    if (iter != declarative_map->end())
+      return iter->second;
+
+    iter = map->find(kDefaultTabId);
+    if (iter != map->end())
+      return iter->second;
+
+    return ValueTraits<T>::CreateEmpty();
+  }
+
   // The id for the extension this action belongs to (as defined in the
   // extension manifest).
   const std::string extension_id_;
@@ -298,6 +329,13 @@ class ExtensionAction {
   std::map<int, SkColor> badge_background_color_;
   std::map<int, SkColor> badge_text_color_;
   std::map<int, Appearance> appearance_;
+  // Declarative state exists for two reasons: First, we need to hide it from
+  // the extension's background/event page to avoid leaking data from hosts the
+  // extension doesn't have permission to access.  Second, the action's state
+  // gets both reset and given its declarative values in response to a
+  // WebContentsObserver::DidNavigateMainFrame event, and there's no way to set
+  // those up to be called in the right order.
+  std::map<int, Appearance> declarative_appearance_;
 
   // IconAnimations are destroyed by a delayed task on the UI message loop so
   // that even if the Extension and ExtensionAction are destroyed on a non-UI