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

chrome/test/automation/proxy_launcher.h

Index: chrome/test/automation/proxy_launcher.h
diff --git a/chrome/test/automation/proxy_launcher.h b/chrome/test/automation/proxy_launcher.h
index 811366ba80c23e6b490c2222165a411e473d105c..0863c6cc5fc529ddbe5cf0ed922b992dd9c581c4 100644
--- a/chrome/test/automation/proxy_launcher.h
+++ b/chrome/test/automation/proxy_launcher.h
@@ -288,8 +288,11 @@ 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(
@@ -301,9 +304,10 @@ class NamedProxyLauncher : public ProxyLauncher {
   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);