Add webdriver endpoint to send custom debugger commands

chrome/test/chromedriver/chrome/web_view.h

Index: chrome/test/chromedriver/chrome/web_view.h
diff --git a/chrome/test/chromedriver/chrome/web_view.h b/chrome/test/chromedriver/chrome/web_view.h
index 2da07697b57b7b13aac3797c14299c1f82e73fc5..6bd3b7bbf340c6d80f0549b677d7705d630d3ea2 100644
--- a/chrome/test/chromedriver/chrome/web_view.h
+++ b/chrome/test/chromedriver/chrome/web_view.h
@@ -53,6 +53,16 @@ class WebView {
   // Reload the current page.
   virtual Status Reload(const Timeout* timeout) = 0;
 
+  // Send a command to the DevTools debugger
+  virtual Status SendCommand(const std::string& cmd,
+                             const base::DictionaryValue& params) = 0;
+
+  // Send a command to the DevTools debugger and wait for the result
+  virtual Status SendCommandAndGetResult(
+          const std::string& cmd,
+          const base::DictionaryValue& params,
+          std::unique_ptr<base::Value>* value) = 0;
+
   // Navigate |delta| steps forward in the browser history. A negative value
   // will navigate back in the history. If the delta exceeds the number of items
   // in the browser history, stay on the current page.