Add the navigation redirect-chain to Sync sessions proto for offline analysis.

content/public/common/page_transition_types.cc

Index: content/public/common/page_transition_types.cc
diff --git a/content/public/common/page_transition_types.cc b/content/public/common/page_transition_types.cc
index 52a0561765d35139c60d0386705622e08c1b7150..87c779f1212adf34ab3a3fc261e721303b029b4a 100644
--- a/content/public/common/page_transition_types.cc
+++ b/content/public/common/page_transition_types.cc
@@ -47,6 +47,10 @@ bool PageTransitionIsRedirect(PageTransition type) {
   return (type & PAGE_TRANSITION_IS_REDIRECT_MASK) != 0;
 }
 
+bool PageTransitionIsForwardBack(PageTransition type) {
+  return (type & PAGE_TRANSITION_FORWARD_BACK) != 0;
+}
+
 int32 PageTransitionGetQualifier(PageTransition type) {
   return type & PAGE_TRANSITION_QUALIFIER_MASK;
 }