Only add API-triggered compilation to compile-script histogram.

R=vogelheim@chromium.org

Review URL: https://codereview.chromium.org/879273003

Cr-Commit-Position: refs/heads/master@{#26308}

src/api.cc

@@ -1598,6 +1598,7 @@ Local<UnboundScript> ScriptCompiler::CompileUnbound(
   ENTER_V8(isolate);
   i::SharedFunctionInfo* raw_result = NULL;
   { i::HandleScope scope(isolate);
+    i::HistogramTimerScope total(isolate->counters()->compile_script(), true);
     i::Handle<i::Object> name_obj;
     int line_offset = 0;
     int column_offset = 0;

src/compiler.cc

@@ -1268,8 +1268,6 @@ Handle<SharedFunctionInfo> Compiler::CompileScript(
     v8::Extension* extension, ScriptData** cached_data,
     ScriptCompiler::CompileOptions compile_options, NativesFlag natives) {
   Isolate* isolate = source->GetIsolate();
-  HistogramTimerScope total(isolate->counters()->compile_script(), true);
-
   if (compile_options == ScriptCompiler::kNoCompileOptions) {
     cached_data = NULL;
   } else if (compile_options == ScriptCompiler::kProduceParserCache ||