Add a function to add extra headers from NavigationThrottle

content/browser/frame_host/navigation_request.cc

Index: content/browser/frame_host/navigation_request.cc
diff --git a/content/browser/frame_host/navigation_request.cc b/content/browser/frame_host/navigation_request.cc
index 0fa8adf29875200f0874ae8ff90e031f309a41ae..a1e067f69abba2a233089877340ece84226efea1 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -7,7 +7,6 @@
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/navigation_controller_impl.h"
-#include "content/browser/frame_host/navigation_handle_impl.h"
 #include "content/browser/frame_host/navigation_request_info.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/browser/loader/navigation_url_loader.h"
@@ -284,7 +283,8 @@ void NavigationRequest::OnRequestStarted(base::TimeTicks timestamp) {
 }
 
 void NavigationRequest::OnStartChecksComplete(
-    NavigationThrottle::ThrottleCheckResult result) {
+    NavigationThrottle::ThrottleCheckResult result,
+    const NavigationHandleImpl::ExtraHeadersList& extra_headers_list) {
   CHECK(result != NavigationThrottle::DEFER);
 
   // Abort the request if needed. This will destroy the NavigationRequest.
@@ -295,13 +295,22 @@ void NavigationRequest::OnStartChecksComplete(
     return;
   }
 
+  // Add extra headers to the request before sending it to the network stack.
+  net::HttpRequestHeaders headers;
+  headers.AddHeadersFromString(begin_params_.headers);
+  for (const auto& header : extra_headers_list)
+    headers.SetHeader(header.first, header.second);
+  begin_params_.headers = headers.ToString();
+  info_->begin_params.headers = headers.ToString();
+
   loader_ = NavigationURLLoader::Create(
       frame_tree_node_->navigator()->GetController()->GetBrowserContext(),
       info_.Pass(), navigation_handle_->service_worker_handle(), this);
 }
 
 void NavigationRequest::OnRedirectChecksComplete(
-    NavigationThrottle::ThrottleCheckResult result) {
+    NavigationThrottle::ThrottleCheckResult result,
+    const NavigationHandleImpl::ExtraHeadersList& extra_headers_list) {
   CHECK(result != NavigationThrottle::DEFER);
 
   // Abort the request if needed. This will destroy the NavigationRequest.
@@ -312,7 +321,7 @@ void NavigationRequest::OnRedirectChecksComplete(
     return;
   }
 
-  loader_->FollowRedirect();
+  loader_->FollowRedirect(extra_headers_list);
   navigation_handle_->DidRedirectNavigation(common_params_.url);
 }