Add webdriver endpoint to send custom debugger commands

chrome/test/chromedriver/devtools_events_logger.h

Index: chrome/test/chromedriver/devtools_events_logger.h
diff --git a/chrome/test/chromedriver/devtools_events_logger.h b/chrome/test/chromedriver/devtools_events_logger.h
new file mode 100644
index 0000000000000000000000000000000000000000..570e7e56e2ccf35c0023cda42db5ee2a62953d2a
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+++ b/chrome/test/chromedriver/devtools_events_logger.h
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+// Copyright 2017 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_DEVTOOLS_EVENTS_LOGGER_H_
+#define CHROME_TEST_CHROMEDRIVER_DEVTOOLS_EVENTS_LOGGER_H_
+
+#include <string>
+#include <unordered_set>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/values.h"
+#include "chrome/test/chromedriver/chrome/devtools_event_listener.h"
+#include "chrome/test/chromedriver/chrome/log.h"
+#include "chrome/test/chromedriver/chrome/status.h"
+
+// Collects DevTools events into Log messages with info level.
+//
+// The message is a JSON string of the following structure:
+// {
+//    "message": { "method": "...", "params": { ... }}  // DevTools message.
+// }
+
+class DevToolsEventsLogger : public DevToolsEventListener {
+ public:
+  // Creates a |DevToolsEventsLogger| with specific preferences.
+  DevToolsEventsLogger(Log* log, const base::ListValue* prefs);
+
+  ~DevToolsEventsLogger() override;
+
+  Status OnConnected(DevToolsClient* client) override;
+
+  Status OnEvent(DevToolsClient* client,
+                 const std::string& method,
+                 const base::DictionaryValue& params) override;
+
+ private:
+  Log* log_;  // The log where to create entries.
+
+  const base::ListValue* prefs_;
+  std::unordered_set<std::string> events_;
+
+  DISALLOW_COPY_AND_ASSIGN(DevToolsEventsLogger);
+};
+
+#endif  // CHROME_TEST_CHROMEDRIVER_DEVTOOLS_EVENTS_LOGGER_H_