Add Inspector Agent for WebPerf, add probes in V8ScriptRunner.

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

Index: third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
diff --git a/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
new file mode 100644
index 0000000000000000000000000000000000000000..70007d439bdde80538feba2c07f973583622d7a4
--- /dev/null
+++ b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
@@ -0,0 +1,37 @@
+// 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.
+
+#ifndef InspectorWebPerfAgent_h
+#define InspectorWebPerfAgent_h
+
+#include "core/CoreExport.h"
+#include "core/inspector/InspectorBaseAgent.h"
+
+namespace blink {
+
+class LocalFrame;
+class InspectedFrames;
+
+// Inspector Agent for Web Performance APIs
+class CORE_EXPORT InspectorWebPerfAgent final : public InspectorAgent {
+    WTF_MAKE_NONCOPYABLE(InspectorWebPerfAgent);
+public:
+    InspectorWebPerfAgent(InspectedFrames*);
+    ~InspectorWebPerfAgent() override;
+    DECLARE_VIRTUAL_TRACE();
+
+    // Base agent methods.
+    void init(InstrumentingAgents*, protocol::UberDispatcher*, protocol::DictionaryValue*) override {}
+    void dispose() override {}
+
+    void willExecuteScript(LocalFrame*);
+    void didExecuteScript();
+
+private:
+    Member<InspectedFrames> m_inspectedFrames;
+};
+
+} // namespace blink
+
+#endif // InspectorWebPerfAgent_h