[chromedriver] Implement SwitchToFrame command.

chrome/test/chromedriver/dom_tracker.h

Index: chrome/test/chromedriver/dom_tracker.h
diff --git a/chrome/test/chromedriver/dom_tracker.h b/chrome/test/chromedriver/dom_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..0282de5ff6b5b3354521acc2baba2c99cfc6ed18
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+++ b/chrome/test/chromedriver/dom_tracker.h
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+// Copyright (c) 2012 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 CHROME_TEST_CHROMEDRIVER_DOM_TRACKER_H_
+#define CHROME_TEST_CHROMEDRIVER_DOM_TRACKER_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chrome/test/chromedriver/devtools_event_listener.h"
+
+namespace base {
+class DictionaryValue;
+class Value;
+}
+
+class Status;
+
+// Tracks the state of the DOM and execution context creation.
+class DomTracker : public DevToolsEventListener {
+ public:
+  DomTracker();
+  virtual ~DomTracker();
+
+  Status GetFrameIdForNode(int node_id, std::string* frame_id);
+  Status GetContextIdForFrame(const std::string& frame_id, int* context_id);
+
+  // Overridden from DevToolsEventListener:
+  virtual void OnEvent(const std::string& method,
+                       const base::DictionaryValue& params) OVERRIDE;
+
+ private:
+  bool ProcessNodeList(const base::Value* nodes);
+  bool ProcessNode(const base::Value* node);
+
+  typedef std::map<int, std::string> NodeToFrameMap;
+  typedef std::map<std::string, int> FrameToContextMap;
+  NodeToFrameMap node_to_frame_map_;
+  FrameToContextMap frame_to_context_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(DomTracker);
+};
+
+#endif  // CHROME_TEST_CHROMEDRIVER_DOM_TRACKER_H_