Use a schema to decode 3rd party policy on windows, when present.

chrome/browser/policy/configuration_policy_provider_test.h

Index: chrome/browser/policy/configuration_policy_provider_test.h
diff --git a/chrome/browser/policy/configuration_policy_provider_test.h b/chrome/browser/policy/configuration_policy_provider_test.h
index a24519c4d89196218f57af5f02dfba57fc307a62..1404b96135b7dba2c3a259ac024ada9b2c3cce58 100644
--- a/chrome/browser/policy/configuration_policy_provider_test.h
+++ b/chrome/browser/policy/configuration_policy_provider_test.h
@@ -97,6 +97,10 @@ class PolicyProviderTestHarness {
       const std::string& policy_name,
       const base::DictionaryValue* policy_value) = 0;
 
+  // Not every provider supports installing 3rd party policy. Those who do
+  // should override this method; the default just makes the test fail.
+  virtual void Install3rdPartyPolicy(const base::DictionaryValue* policies);
+
  private:
   PolicyLevel level_;
   PolicyScope scope_;
@@ -133,6 +137,19 @@ class ConfigurationPolicyProviderTest
   DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyProviderTest);
 };
 
+// An extension of ConfigurationPolicyProviderTest that also tests loading of
+// 3rd party policy. Policy provider implementations that support loading of
+// 3rd party policy should also instantiate these tests.
+class Configuration3rdPartyPolicyProviderTest
+    : public ConfigurationPolicyProviderTest {
+  protected:
+    Configuration3rdPartyPolicyProviderTest();
+    virtual ~Configuration3rdPartyPolicyProviderTest();
+
+  private:
+    DISALLOW_COPY_AND_ASSIGN(Configuration3rdPartyPolicyProviderTest);
+};
+
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_TEST_H_