[Policy] HostContentSettingsMap: Add AreUserExceptionsAllowedForType() and tests.

components/content_settings/core/test/content_settings_test_utils.h

Index: components/content_settings/core/test/content_settings_test_utils.h
diff --git a/components/content_settings/core/test/content_settings_test_utils.h b/components/content_settings/core/test/content_settings_test_utils.h
index 2374df07f87c866d2b22235c220146130d3d3c54..61622d01831dcd34c78079098605027e1576f269 100644
--- a/components/content_settings/core/test/content_settings_test_utils.h
+++ b/components/content_settings/core/test/content_settings_test_utils.h
@@ -5,11 +5,15 @@
 #ifndef COMPONENTS_CONTENT_SETTINGS_CORE_TEST_CONTENT_SETTINGS_TEST_UTILS_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_TEST_CONTENT_SETTINGS_TEST_UTILS_H_
 
+#include <string>
+
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "components/content_settings/core/browser/content_settings_utils.h"
 
+class HostContentSettingsMap;
+
 namespace content_settings {
 
 class TestUtils {
@@ -45,6 +49,12 @@ class TestUtils {
       ContentSettingsPattern* primary_pattern,
       ContentSettingsPattern* secondary_pattern);
 
+  // Adds a pattern into the PrefProvider in |settings_map|.
+  static bool AddUserException(const std::string& pattern_string,
+                               ContentSettingsType content_type,
+                               ContentSetting setting,
+                               HostContentSettingsMap* settings_map);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(TestUtils);
 };