Query API: Introduces an OfflinePageModelQuery object.

components/offline_pages/client_policy_controller.h

Index: components/offline_pages/client_policy_controller.h
diff --git a/components/offline_pages/client_policy_controller.h b/components/offline_pages/client_policy_controller.h
index 2d89cc923d5a36555eaba0c2f1108abcbee19e2b..8e2d21a4268cf48a22013575a9d3e185f787535e 100644
--- a/components/offline_pages/client_policy_controller.h
+++ b/components/offline_pages/client_policy_controller.h
@@ -35,6 +35,9 @@ class ClientPolicyController {
   // Get the client policy for |name_space|.
   const OfflinePageClientPolicy& GetPolicy(const std::string& name_space) const;
 
+  // Returns a list of all known namespaces.
+  std::vector<std::string> GetAllNamespaces() const;
+
   // Returns whether pages for |name_space| should be removed on cache reset.
   bool IsRemovedOnCacheReset(const std::string& name_space) const;
 
@@ -53,6 +56,9 @@ class ClientPolicyController {
   bool IsRestrictedToOriginalTab(const std::string& name_space) const;
   const std::vector<std::string>& GetNamespacesRestrictedToOriginalTab() const;
 
+  void AddPolicyForTest(const std::string& name_space,
+                        const OfflinePageClientPolicyBuilder& builder);
+
  private:
   // The map from name_space to a client policy. Will be generated
   // as pre-defined values for now.