PlzNavigate: store POST data in the FrameNavigationEntry

content/common/page_state_serialization.h

Index: content/common/page_state_serialization.h
diff --git a/content/common/page_state_serialization.h b/content/common/page_state_serialization.h
index 24d81981ef84bbba89f624f01e58163565e154a8..42b6f3074bb6cc7d63f47b3fd35732d148f14df5 100644
--- a/content/common/page_state_serialization.h
+++ b/content/common/page_state_serialization.h
@@ -12,6 +12,7 @@
 #include "base/strings/nullable_string16.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
+#include "content/common/resource_request_body.h"
 #include "third_party/WebKit/public/platform/WebHTTPBody.h"
 #include "third_party/WebKit/public/platform/WebHistoryScrollRestorationType.h"
 #include "third_party/WebKit/public/platform/WebReferrerPolicy.h"
@@ -44,6 +45,7 @@ struct CONTENT_EXPORT ExplodedHttpBody {
   bool is_null;
 
   ExplodedHttpBody();
+  ExplodedHttpBody(const ExplodedHttpBody& other);
   ~ExplodedHttpBody();
 };
 
@@ -88,6 +90,11 @@ CONTENT_EXPORT bool DecodePageState(const std::string& encoded,
 CONTENT_EXPORT bool EncodePageState(const ExplodedPageState& exploded,
                                     std::string* encoded);
 
+// If |exploded| is not null, initializes |http_body| with the data from
+// |exploded|. Returns false otherwise.
+bool GeneratePostData(const ExplodedHttpBody exploded,
+                      ResourceRequestBody* http_body);
+
 #if defined(OS_ANDROID)
 CONTENT_EXPORT bool DecodePageStateWithDeviceScaleFactorForTesting(
     const std::string& encoded,