Added support for signed policy blobs on desktop.

components/policy/core/common/cloud/policy_header_service.h

Index: components/policy/core/common/cloud/policy_header_service.h
diff --git a/components/policy/core/common/cloud/policy_header_service.h b/components/policy/core/common/cloud/policy_header_service.h
index b797c2a336beaae534b538243869dab33e06d6fd..e55c08b7c69e96e2be7e831ea5d8b1be5d86cc32 100644
--- a/components/policy/core/common/cloud/policy_header_service.h
+++ b/components/policy/core/common/cloud/policy_header_service.h
@@ -30,6 +30,7 @@ class POLICY_EXPORT PolicyHeaderService : public CloudPolicyStore::Observer {
   // device policy. Both |user_policy_store| and |device_policy_store| must
   // outlive this object.
   PolicyHeaderService(const std::string& server_url,
+                      const std::string& verification_key_hash,
                       CloudPolicyStore* user_policy_store,
                       CloudPolicyStore* device_policy_store);
   virtual ~PolicyHeaderService();
@@ -56,6 +57,9 @@ class POLICY_EXPORT PolicyHeaderService : public CloudPolicyStore::Observer {
   // URL of the policy server.
   std::string server_url_;
 
+  // Identifier for the verification key this Chrome instance is using.
+  std::string verification_key_hash_;
+
   // Weak pointers to User-/Device-level policy stores.
   CloudPolicyStore* user_policy_store_;
   CloudPolicyStore* device_policy_store_;