Add Inspector Agent for WebPerf, add probes in V8ScriptRunner.

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

Index: third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6f99692e698373030d5c0de4453b72f971312f91
--- /dev/null
+++ b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.cpp
@@ -0,0 +1,34 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/inspector/InspectorWebPerfAgent.h"
+
+#include "core/frame/LocalFrame.h"
+#include "core/inspector/InspectedFrames.h"
+
+namespace blink {
+
+InspectorWebPerfAgent::InspectorWebPerfAgent(InspectedFrames* inspectedFrames)
+    : m_inspectedFrames(inspectedFrames)
+{
+}
+
+InspectorWebPerfAgent::~InspectorWebPerfAgent()
+{
+}
+
+void InspectorWebPerfAgent::willExecuteScript(ExecutionContext* context)
+{
+}
+
+void InspectorWebPerfAgent::didExecuteScript()
+{
+}
+
+DEFINE_TRACE(InspectorWebPerfAgent)
+{
+    visitor->trace(m_inspectedFrames);
+}
+
+} // namespace blink