Add a function to add extra headers from NavigationThrottle

content/browser/frame_host/navigation_handle_impl.h

Index: content/browser/frame_host/navigation_handle_impl.h
diff --git a/content/browser/frame_host/navigation_handle_impl.h b/content/browser/frame_host/navigation_handle_impl.h
index 26ead9b534a9c181b8da848215642939b00cf468..bcd407393d69234cc49c9657c4669dac9b1e49fa 100644
--- a/content/browser/frame_host/navigation_handle_impl.h
+++ b/content/browser/frame_host/navigation_handle_impl.h
@@ -112,9 +112,15 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
     return service_worker_handle_.get();
   }
 
-  typedef base::Callback<void(NavigationThrottle::ThrottleCheckResult)>
+  typedef std::vector<std::pair<std::string, std::string> > ExtraHeadersList;

[nasko, 2015/11/06 23:51:51]

The new style requires "using " syntax. Please convert both typedefs to using.

[clamy, 2015/11/09 15:47:09]

Done.

+  typedef base::Callback<void(NavigationThrottle::ThrottleCheckResult,
+                              const ExtraHeadersList&)>
       ThrottleChecksFinishedCallback;
 
+  // Adds an entry in the ExtraHeadersList. The extra header itself will be
+  // added to the request when the ThrottleChecksFinishedCallback will be run.
+  void AddExtraHeader(const std::string& name, const std::string& value);
+
   // Called when the URLRequest will start in the network stack.  |callback|
   // will be called when all throttle checks have completed. This will allow
   // the caller to cancel the navigation or let it proceed.
@@ -202,6 +208,10 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
   // The index of the next throttle to check.
   size_t next_index_;
 
+  // Passed back to the handler of the navigation request after the throttles
+  // checks have been performed.
+  ExtraHeadersList extra_headers_to_add_;
+
   // This callback will be run when all throttle checks have been performed.
   ThrottleChecksFinishedCallback complete_callback_;