Send screenshots back to the client for debugging

chrome/test/webdriver/commands/navigate_commands.cc

Index: chrome/test/webdriver/commands/navigate_commands.cc
diff --git a/chrome/test/webdriver/commands/navigate_commands.cc b/chrome/test/webdriver/commands/navigate_commands.cc
index f65c6959ee218399ffc3879249926b3d2ea8dcea..6338e06a8cc2ede6fe27a23bf1a7d054de101924 100644
--- a/chrome/test/webdriver/commands/navigate_commands.cc
+++ b/chrome/test/webdriver/commands/navigate_commands.cc
@@ -24,7 +24,7 @@ void ForwardCommand::ExecutePost(Response* const response) {
     return;
   }
 
-  session_->set_current_frame_xpath("");
+  session_->SetCurrentFrameXPath("");
   response->SetStatus(kSuccess);
 }
 
@@ -48,7 +48,7 @@ void BackCommand::ExecutePost(Response* const response) {
     return;
   }
 
-  session_->set_current_frame_xpath("");
+  session_->SetCurrentFrameXPath("");
   response->SetStatus(kSuccess);
 }
 
@@ -72,7 +72,7 @@ void RefreshCommand::ExecutePost(Response* const response) {
     return;
   }
 
-  session_->set_current_frame_xpath("");
+  session_->SetCurrentFrameXPath("");
   response->SetStatus(kSuccess);
 }