[DevTools] replaced slow ::serialize with StringBuilder

third_party/WebKit/Source/core/inspector/MainThreadDebugger.cpp

 /*
  * Copyright (c) 2011 Google Inc. 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
@@ skipping 41 matching lines @@
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/inspector/ConsoleMessageStorage.h"
 #include "core/inspector/IdentifiersFactory.h"
 #include "core/inspector/InspectedFrames.h"
 #include "core/inspector/InspectorTaskRunner.h"
 #include "core/inspector/V8InspectorString.h"
-#include "core/inspector/protocol/Protocol.h"
 #include "core/page/Page.h"
 #include "core/timing/MemoryInfo.h"
 #include "core/workers/MainThreadWorkletGlobalScope.h"
 #include "core/xml/XPathEvaluator.h"
 #include "core/xml/XPathResult.h"
 #include "platform/UserGestureIndicator.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/ThreadingPrimitives.h"
+#include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 namespace {
 
 int frameId(LocalFrame* frame) {
   ASSERT(frame);
   return WeakIdentifierMap<LocalFrame>::identifier(frame);
 }
 
@@ skipping 56 matching lines @@
   if (frame->localFrameRoot() == frame)
     v8Inspector()->resetContextGroup(contextGroupId(frame));
 }
 
 void MainThreadDebugger::contextCreated(ScriptState* scriptState,
                                         LocalFrame* frame,
                                         SecurityOrigin* origin) {
   ASSERT(isMainThread());
   v8::HandleScope handles(scriptState->isolate());
   DOMWrapperWorld& world = scriptState->world();
-  std::unique_ptr<protocol::DictionaryValue> auxDataValue =
-      protocol::DictionaryValue::create();
-  auxDataValue->setBoolean("isDefault", world.isMainWorld());
-  auxDataValue->setString("frameId", IdentifiersFactory::frameId(frame));
-  String auxData = auxDataValue->serialize();
+  StringBuilder auxDataBuilder;
+  auxDataBuilder.append("{\"isDefault\":");
+  auxDataBuilder.append(world.isMainWorld() ? "true" : "false");
+  auxDataBuilder.append(",\"frameId\":\"");
+  auxDataBuilder.append(IdentifiersFactory::frameId(frame));
+  auxDataBuilder.append("\"}");
+  String auxData = auxDataBuilder.toString();
   String humanReadableName = world.isIsolatedWorld()
                                  ? world.isolatedWorldHumanReadableName()
                                  : String();
   String originString = origin ? origin->toRawString() : String();
   v8_inspector::V8ContextInfo contextInfo(
       scriptState->context(), contextGroupId(frame),
       toV8InspectorStringView(humanReadableName));
   contextInfo.origin = toV8InspectorStringView(originString);
   contextInfo.auxData = toV8InspectorStringView(auxData);
   contextInfo.hasMemoryOnConsole =
@@ skipping 300 matching lines @@
                context, nodes, index++,
                ToV8(node, info.Holder(), info.GetIsolate()))
                .FromMaybe(false))
         return;
     }
     info.GetReturnValue().Set(nodes);
   }
 }
 
 }  // namespace blink