Re-applying r76324, which was reverted during a WebKit rollback.

chrome/common/render_messages.cc

Index: chrome/common/render_messages.cc
diff --git a/chrome/common/render_messages.cc b/chrome/common/render_messages.cc
index 300106aabf87f9a025207fd2f917182a28806bf1..a85ae5e7036646bef71b8fbb0c9f727a6d4e9a6f 100644
--- a/chrome/common/render_messages.cc
+++ b/chrome/common/render_messages.cc
@@ -680,6 +680,7 @@ void ParamTraits<WebPreferences>::Write(Message* m, const param_type& p) {
   WriteParam(m, p.accelerated_video_enabled);
   WriteParam(m, p.memory_info_enabled);
   WriteParam(m, p.interactive_form_validation_enabled);
+  WriteParam(m, p.fullscreen_enabled);
 }
 
 bool ParamTraits<WebPreferences>::Read(const Message* m, void** iter,
@@ -736,7 +737,8 @@ bool ParamTraits<WebPreferences>::Read(const Message* m, void** iter,
       ReadParam(m, iter, &p->accelerated_layers_enabled) &&
       ReadParam(m, iter, &p->accelerated_video_enabled) &&
       ReadParam(m, iter, &p->memory_info_enabled) &&
-      ReadParam(m, iter, &p->interactive_form_validation_enabled);
+      ReadParam(m, iter, &p->interactive_form_validation_enabled) &&
+      ReadParam(m, iter, &p->fullscreen_enabled);
 }
 
 void ParamTraits<WebPreferences>::Log(const param_type& p, std::string* l) {