Trace where timers were scheduled in Blink

Source/platform/TraceLocation.h

Index: Source/platform/TraceLocation.h
diff --git a/Source/platform/TraceLocation.h b/Source/platform/TraceLocation.h
new file mode 100644
index 0000000000000000000000000000000000000000..c13f4352cd52e8f042adcb67fdecddc7715c2948
--- /dev/null
+++ b/Source/platform/TraceLocation.h
@@ -0,0 +1,40 @@
+// Copyright 2014 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 TraceLocation_h
+#define TraceLocation_h
+
+// This is intentionally similar to base/location.h
+// that we could easily replace usage of TraceLocation
+// with base::Location after merging into Chromium.
+
+namespace WebCore {
+
+class TraceLocation {
+public:
+    // Currenetly only store the bits used in Blink, base::Location stores more.
+    // These char*s are not copied and must live for the duration of the program.
+    TraceLocation(const char* functionName, const char* fileName)
+        : m_functionName(functionName)
+        , m_fileName(fileName)
+    { }
+
+    TraceLocation()
+        : m_functionName("unknown")
+        , m_fileName("unknown")
+    { }
+
+    const char* functionName() const { return m_functionName; }
+    const char* fileName() const { return m_fileName; }
+
+private:
+    const char* m_functionName;
+    const char* m_fileName;
+};
+
+#define FROM_HERE WebCore::TraceLocation(__FUNCTION__, __FILE__)
+
+}
+
+#endif // TraceLocation_h