Add histograms to track fraction of heap spaces and percentage of crankshaft code.

src/codegen.cc

Index: src/codegen.cc
diff --git a/src/codegen.cc b/src/codegen.cc
index d33c7f06bd44e077badacee8ec2e3ca2bf1b1014..b15324c8cf0ba6f98a7a8fa481f58bc2de0606bb 100644
--- a/src/codegen.cc
+++ b/src/codegen.cc
@@ -116,6 +116,8 @@ Handle<Code> CodeGenerator::MakeCodeEpilogue(MacroAssembler* masm,
                                   false, is_crankshafted);
   isolate->counters()->total_compiled_code_size()->Increment(
       code->instruction_size());
+  isolate->heap()->IncrementCodeGeneratedBytes(is_crankshafted,
+      code->instruction_size());
   code->set_prologue_offset(info->prologue_offset());
   return code;
 }