Send screenshots back to the client for debugging

chrome/test/webdriver/commands/find_element_commands.cc

 // 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.
 
 #include "chrome/test/webdriver/commands/find_element_commands.h"
 
 #include <sstream>
 #include <string>
 
 #include "base/string_number_conversions.h"
@@ skipping 93 matching lines @@
     }
 
     error = session_->ExecuteScript(jscript, args.get(), &result);
     if (error == kSuccess) {
       // If searching for many elements, make sure we found at least one before
       // stopping.
       done = find_one_element_ ||
              (result->GetType() == Value::TYPE_LIST &&
              static_cast<ListValue*>(result)->GetSize() > 0);
     } else if (error != kNoSuchElement) {
-      SET_WEBDRIVER_ERROR(response, "Internal error in find_element atom",
-                          kInternalServerError);
+      SET_WEBDRIVER_SCREENSHOT_ERROR(response,
+                                     session_,
+                                     "Internal error in find_element atom",
+                                     kInternalServerError);
       return;
     }
 
     int64 elapsed_time = (base::Time::Now() - start_time).InMilliseconds();
     done = done || elapsed_time > session_->implicit_wait();
     base::PlatformThread::Sleep(50);  // Prevent a busy loop that eats the cpu.
   }
 
   response->SetValue(result);
   response->SetStatus(error);
 }
 
 bool FindElementCommand::RequiresValidTab() {
   return false;
 }
 
 }  // namespace webdriver