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..c17d264bc9212feeccdd9c986d49cae8f1a4427b 100644
--- a/chrome/test/chromedriver/chrome/web_view.h
+++ b/chrome/test/chromedriver/chrome/web_view.h
@@ -49,6 +49,12 @@ class WebView {
 
   // Load a given URL in the main frame.
   virtual Status Load(const std::string& url, const Timeout* timeout) = 0;
+  virtual Status SendCommand(std::string* cmd,

[johnchen, 2017/04/26 05:17:47]

I think it's better for the first parameter to be const std::string&, both for
this method and the next one.

[em, 2017/04/27 05:02:09]

Done.

+                             const base::DictionaryValue& params) = 0;
+  virtual Status SendCommandAndGetResult(
+          std::string* cmd,
+          const base::DictionaryValue& params,
+          std::unique_ptr<base::Value>* value) = 0;
 
   // Reload the current page.
   virtual Status Reload(const Timeout* timeout) = 0;