PlzNavigate: store POST data in the FrameNavigationEntry

content/browser/frame_host/frame_navigation_entry.h

Index: content/browser/frame_host/frame_navigation_entry.h
diff --git a/content/browser/frame_host/frame_navigation_entry.h b/content/browser/frame_host/frame_navigation_entry.h
index 5470c484fbb086c9a7608d98bff4bc06c741d35c..212aad45092b44a4366d62e5a6d0aee71d18b1b8 100644
--- a/content/browser/frame_host/frame_navigation_entry.h
+++ b/content/browser/frame_host/frame_navigation_entry.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/site_instance_impl.h"
+#include "content/common/resource_request_body.h"
 #include "content/public/common/page_state.h"
 #include "content/public/common/referrer.h"
 
@@ -121,6 +122,10 @@ class CONTENT_EXPORT FrameNavigationEntry
   int64_t post_id() const { return post_id_; }
   void set_post_id(int64_t post_id) { post_id_ = post_id; }
 
+  // The data sent during a POST navigation. Returns nullptr if the navigation
+  // is not a POST.
+  scoped_refptr<ResourceRequestBody> GetPostData() const;
+
  private:
   friend class base::RefCounted<FrameNavigationEntry>;
   virtual ~FrameNavigationEntry();