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

src/lithium.cc

Index: src/lithium.cc
===================================================================
--- src/lithium.cc	(revision 13276)
+++ src/lithium.cc	(working copy)
@@ -416,6 +416,12 @@
 
 Handle<Code> LChunk::Codegen(Code::Kind kind) {
   MacroAssembler assembler(info()->isolate(), NULL, 0);
+  if (info()->isolate()->logger()->is_code_event_handler_enabled()) {
+    JITCodeLineInfo* lineinfo =
+        assembler.positions_recorder()->InitializeJITLineInfo();
+    LOG_CODE_EVENT(info()->isolate(),
+                   CodeStartLinePosInfoRecordEvent(lineinfo));
+  }
   LCodeGen generator(this, &assembler, info());
 
   MarkEmptyBlocks();
@@ -429,6 +435,15 @@
     Handle<Code> code =
         CodeGenerator::MakeCodeEpilogue(&assembler, flags, info());
     generator.FinishCode(code);
+
+    if (info()->isolate()->logger()->is_code_event_handler_enabled()) {
+      if (!code.is_null()) {
+        JITCodeLineInfo* lineinfo =
+            assembler.positions_recorder()->DetachJITLineInfo();
+        LOG_CODE_EVENT(info()->isolate(),
+                       CodeEndLinePosInfoRecordEvent(*code, lineinfo));
+      }
+    }
     CodeGenerator::PrintCode(code, info());
     return code;
   }