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

src/lithium.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 411 matching lines @@
 
   chunk->set_allocated_double_registers(
       allocator.assigned_double_registers());
 
   return chunk;
 }
 
 
 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();
 
   if (generator.GenerateCode()) {
     if (FLAG_trace_codegen) {
       PrintF("Crankshaft Compiler - ");
     }
     CodeGenerator::MakeCodePrologue(info());
     Code::Flags flags = Code::ComputeFlags(kind);
     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;
   }
   return Handle<Code>::null();
 }
 
 
 void LChunk::RegisterDependentCodeForEmbeddedMaps(Handle<Code> code) {
   ZoneList<Handle<Map> > maps(1, zone());
   int mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
@@ skipping 30 matching lines @@
       } else {
         spill_slot_count_++;
       }
     }
     iterator.Advance();
   }
 }
 
 
 } }  // namespace v8::internal