Forwarding POST body into renderer after a cross-site transfer.

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index 240eba7416107135f096249c2f9b94954e080c84..0846be9714c002be02b151eabaaf26fcee063b12 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -12,6 +12,7 @@
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
 #include "content/browser/service_worker/service_worker_navigation_handle.h"
 #include "content/common/frame_messages.h"
+#include "content/common/resource_request_body.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/common/content_client.h"
@@ -250,7 +251,7 @@ NavigationHandleImpl::CallWillStartRequestForTesting(
     ui::PageTransition transition,
     bool is_external_protocol) {
   NavigationThrottle::ThrottleCheckResult result = NavigationThrottle::DEFER;
-  WillStartRequest(is_post ? "POST" : "GET", sanitized_referrer,
+  WillStartRequest(is_post ? "POST" : "GET", nullptr, sanitized_referrer,
                    has_user_gesture, transition, is_external_protocol,
                    base::Bind(&UpdateThrottleCheckResult, &result));
 
@@ -289,6 +290,7 @@ void NavigationHandleImpl::InitServiceWorkerHandle(
 
 void NavigationHandleImpl::WillStartRequest(
     const std::string& method,
+    const scoped_refptr<content::ResourceRequestBody>& resource_request_body,
     const Referrer& sanitized_referrer,
     bool has_user_gesture,
     ui::PageTransition transition,
@@ -296,6 +298,7 @@ void NavigationHandleImpl::WillStartRequest(
     const ThrottleChecksFinishedCallback& callback) {
   // Update the navigation parameters.
   method_ = method;
+  resource_request_body_ = resource_request_body;
   sanitized_referrer_ = sanitized_referrer;
   has_user_gesture_ = has_user_gesture;
   transition_ = transition;
@@ -339,6 +342,8 @@ void NavigationHandleImpl::WillRedirectRequest(
   is_external_protocol_ = new_is_external_protocol;
   response_headers_ = response_headers;
   was_redirected_ = true;
+  if (new_method != "POST")
+    resource_request_body_ = nullptr;
 
   state_ = WILL_REDIRECT_REQUEST;
   complete_callback_ = callback;