[chromedriver] Implement reconnection to DevTools.

chrome/test/chromedriver/web_view.h

Index: chrome/test/chromedriver/web_view.h
diff --git a/chrome/test/chromedriver/web_view.h b/chrome/test/chromedriver/web_view.h
index 5c4006b9f5494d415bf9ad61e261435bf7af7438..7edeb9254767ccee1b593ebecd3915a7a3f5f9b7 100644
--- a/chrome/test/chromedriver/web_view.h
+++ b/chrome/test/chromedriver/web_view.h
@@ -27,6 +27,9 @@ class WebView {
   // Return the id for this WebView.
   virtual std::string GetId() = 0;
 
+  // Make DevToolsCient connect to DevTools if it is disconnected.
+  virtual Status ConnectIfNecessary() = 0;
+
   // Close the WebView itself.
   virtual Status Close() = 0;