Cache --whitelisted-extension-id in SimpleFeature.

extensions/common/features/simple_feature.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_COMMON_FEATURES_SIMPLE_FEATURE_H_
 #define EXTENSIONS_COMMON_FEATURES_SIMPLE_FEATURE_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 11 matching lines @@
 
 namespace extensions {
 
 class BaseFeatureProviderTest;
 class ExtensionAPITest;
 class ManifestUnitTest;
 class SimpleFeatureTest;
 
 class SimpleFeature : public Feature {
  public:
+  // Used by tests to override the cached --whitelisted-extension-id.
+  class ScopedWhitelistForTest {
+   public:
+    explicit ScopedWhitelistForTest(const std::string& id);
+    ~ScopedWhitelistForTest();
+
+   private:
+    std::string* previous_id_;
+
+    DISALLOW_COPY_AND_ASSIGN(ScopedWhitelistForTest);
+  };
+
   SimpleFeature();
   ~SimpleFeature() override;
 
   // Dependency resolution is a property of Features that is preferrably
   // handled internally to avoid temptation, but FeatureFilters may need
   // to know if there are any at all.
   bool HasDependencies() const;
 
   // Adds a filter to this feature. The feature takes ownership of the filter.
   void AddFilter(scoped_ptr<SimpleFeatureFilter> filter);
@@ skipping 150 matching lines @@
   std::string command_line_switch_;
 
   ScopedVector<SimpleFeatureFilter> filters_;;
 
   DISALLOW_COPY_AND_ASSIGN(SimpleFeature);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_FEATURES_SIMPLE_FEATURE_H_