This patch is the propagation version of https://codereview.chromium.org/10824032 patch

src/lithium.cc

Index: src/lithium.cc
===================================================================
--- src/lithium.cc	(revision 13614)
+++ src/lithium.cc	(working copy)
@@ -429,6 +429,9 @@
 
 Handle<Code> LChunk::Codegen(Code::Kind kind) {
   MacroAssembler assembler(info()->isolate(), NULL, 0);
+  LOG_CODE_EVENT(info()->isolate(),
+                 CodeStartLinePosInfoRecordEvent(
+                     assembler.positions_recorder()));
   LCodeGen generator(this, &assembler, info());
 
   MarkEmptyBlocks();
@@ -442,9 +445,18 @@
     Handle<Code> code =
         CodeGenerator::MakeCodeEpilogue(&assembler, flags, info());
     generator.FinishCode(code);
+
+    if (!code.is_null()) {
+      void* jit_handler_data =
+          assembler.positions_recorder()->DetachJITHandlerData();
+      LOG_CODE_EVENT(info()->isolate(),
+                     CodeEndLinePosInfoRecordEvent(*code, jit_handler_data));
+    }
+
     if (FLAG_weak_embedded_maps_in_optimized_code) {
       RegisterDependentCodeForEmbeddedMaps(code);
     }
+
     CodeGenerator::PrintCode(code, info());
     return code;
   }