Add a header when fetching pages under the DMServer URL.

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
index dc6c926ed11161ca43383284d1fcb6ab051e59f6..fc08f642d71662fe9c7fd22167a4be375e5e08d2 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
@@ -56,6 +56,10 @@
 #include "net/http/http_response_headers.h"
 #include "net/url_request/url_request.h"
 
+#if defined(ENABLE_CONFIGURATION_POLICY)
+#include "components/policy/core/browser/policy_header_io_helper.h"
+#endif
+
 #if defined(ENABLE_MANAGED_USERS)
 #include "chrome/browser/managed_mode/managed_mode_resource_throttle.h"
 #endif
@@ -288,6 +292,11 @@ void ChromeResourceDispatcherHostDelegate::RequestBeginning(
   AppendChromeSyncGaiaHeader(request, resource_context);
 #endif
 
+#if defined(ENABLE_CONFIGURATION_POLICY)
+  if (io_data->policy_header_helper())
+    io_data->policy_header_helper()->AddPolicyHeaders(request);
+#endif
+
   const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(request);
   signin::AppendMirrorRequestHeaderIfPossible(
       request, GURL() /* redirect_url */,