1 files changed, 11 insertions, 0 deletions
diff --git a/chrome/common/property_bag.h b/chrome/common/property_bag.h
index 9965382..d2f3559 100644
--- a/chrome/common/property_bag.h
+++ b/chrome/common/property_bag.h
@@ -77,6 +77,7 @@ class PropertyBag {
   // The returned pointer will be NULL if there is no match. Ownership of the
   // pointer will stay with the property bag.
   Prop* GetProperty(PropID id);
+  const Prop* GetProperty(PropID id) const;
 
   // Deletes the property with the given ID from the bag if it exists.
   void DeleteProperty(PropID id);
@@ -107,6 +108,9 @@ class PropertyAccessorBase {
   PropertyBag::Prop* GetPropertyInternal(PropertyBag* bag) {
     return bag->GetProperty(prop_id_);
   }
+  const PropertyBag::Prop* GetPropertyInternal(const PropertyBag* bag) const {
+    return bag->GetProperty(prop_id_);
+  }
 
  private:
   // Identifier for this property.
@@ -140,6 +144,12 @@ class PropertyAccessor : public PropertyAccessorBase {
       return NULL;
     return static_cast<Container*>(prop)->get();
   }
+  const T* GetProperty(const PropertyBag* bag) const {
+    const PropertyBag::Prop* prop = GetPropertyInternal(bag);
+    if (!prop)
+      return NULL;
+    return static_cast<const Container*>(prop)->get();
+  }
 
   // See also DeleteProperty on thn PropertyAccessorBase.
 
@@ -149,6 +159,7 @@ class PropertyAccessor : public PropertyAccessorBase {
     Container(const T& data) : data_(data) {}
 
     T* get() { return &data_; }
+    const T* get() const { return &data_; }
 
    private:
     virtual Prop* copy() {