PlzNavigate: store POST data in the FrameNavigationEntry

content/browser/frame_host/frame_navigation_entry.cc

Index: content/browser/frame_host/frame_navigation_entry.cc
diff --git a/content/browser/frame_host/frame_navigation_entry.cc b/content/browser/frame_host/frame_navigation_entry.cc
index a788c45b8b325a75727f8a352b10316bfac3128d..3aada24b87a796293224c8901146babb14028d3c 100644
--- a/content/browser/frame_host/frame_navigation_entry.cc
+++ b/content/browser/frame_host/frame_navigation_entry.cc
@@ -6,6 +6,9 @@
 
 #include <utility>
 
+#include "content/common/page_state_serialization.h"
+#include "content/common/site_isolation_policy.h"
+
 namespace content {
 
 FrameNavigationEntry::FrameNavigationEntry()
@@ -80,4 +83,21 @@ void FrameNavigationEntry::set_document_sequence_number(
   document_sequence_number_ = document_sequence_number;
 }
 
+scoped_refptr<ResourceRequestBody> FrameNavigationEntry::GetPostData() const {
+  DCHECK(SiteIsolationPolicy::UseSubframeNavigationEntries());
+  if (method_ != "POST")
+    return nullptr;
+
+  // Generate the body from the PageState.
+  ExplodedPageState exploded_state;
+  if (!DecodePageState(page_state_.ToEncodedData(), &exploded_state))
+    return nullptr;
+
+  scoped_refptr<ResourceRequestBody> body = new ResourceRequestBody();
+  if (!GeneratePostData(exploded_state.top.http_body, body.get()))
+    return nullptr;
+
+  return body;
+}
+
 }  // namespace content