Let pyauto create an attached webdriver instance to manipulate web pages.

chrome/test/automation/proxy_launcher.h

 // Copyright (c) 2011 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_AUTOMATION_PROXY_LAUNCHER_H_
 #define CHROME_TEST_AUTOMATION_PROXY_LAUNCHER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 270 matching lines @@
 };
 
 // Uses an automation proxy that communicates over a named socket.
 // This is used if you want to connect an AutomationProxy
 // to a browser process that is already running.
 // The channel id of the proxy is a constant specified by kInterfacePath.
 class NamedProxyLauncher : public ProxyLauncher {
  public:
   // If launch_browser is true, launches Chrome with named interface enabled.
   // Otherwise, there should be an existing instance the proxy can connect to.
+  // wait_for_server_channel should be set to false only if it is guaranteed
+  // Chrome's server channel is already listening for connections.
   NamedProxyLauncher(const std::string& channel_id,
                      bool launch_browser,
+                     bool wait_for_server_channel,

[Paweł Hajdan Jr., 2011/07/29 20:48:38]

3 bool parameters next to each other are a recipe for some mix-up. Please use a
less error-prone solution.

Actually, if you don't wait here, how do you know when the channel is ready?

[kkania, 2011/07/29 22:44:19]

Changed to struct.

We know the channel is ready because the
TestingAutomationProvider::CreateNewAutomationProvider method does not return
until the server socket is listening, because the ChannelProxy creates it
immediately on the UI thread.

                      bool disconnect_on_failure);
 
   virtual AutomationProxy* CreateAutomationProxy(
       int execution_timeout) OVERRIDE;
   virtual bool InitializeConnection(
       const LaunchState& state,
       bool wait_for_initial_loads) OVERRIDE WARN_UNUSED_RESULT;
   virtual void TerminateConnection() OVERRIDE;
   virtual std::string PrefixedChannelID() const OVERRIDE;
 
  protected:
-  std::string channel_id_;      // Channel id of automation proxy.
-  bool launch_browser_;         // True if we should launch the browser too.
-  bool disconnect_on_failure_;  // True if we disconnect on IPC channel failure.
+  std::string channel_id_;        // Channel id of automation proxy.
+  bool launch_browser_;           // True if we should launch the browser too.
+  bool wait_for_server_channel_;  // True if we should wait for server channel.
+  bool disconnect_on_failure_;    // True if we disconnect on channel failure.
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NamedProxyLauncher);
 };
 
 // Uses an automation proxy that communicates over an anonymous socket.
 class AnonymousProxyLauncher : public ProxyLauncher {
  public:
   explicit AnonymousProxyLauncher(bool disconnect_on_failure);
   virtual AutomationProxy* CreateAutomationProxy(
       int execution_timeout) OVERRIDE;
   virtual bool InitializeConnection(
       const LaunchState& state,
       bool wait_for_initial_loads) OVERRIDE WARN_UNUSED_RESULT;
   virtual void TerminateConnection() OVERRIDE;
   virtual std::string PrefixedChannelID() const OVERRIDE;
 
  protected:
   std::string channel_id_;      // Channel id of automation proxy.
   bool disconnect_on_failure_;  // True if we disconnect on IPC channel failure.
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AnonymousProxyLauncher);
 };
 
 #endif  // CHROME_TEST_AUTOMATION_PROXY_LAUNCHER_H_