Make content shell activate and focus dev tools on show.

content/shell/browser/shell_devtools_frontend.cc

Index: content/shell/browser/shell_devtools_frontend.cc
diff --git a/content/shell/browser/shell_devtools_frontend.cc b/content/shell/browser/shell_devtools_frontend.cc
index 3c25aa1db20019bb25bf4c699dcdd547cc350c60..aa6afe1aee0829d4adf212ad28fdf88310c8c251 100644
--- a/content/shell/browser/shell_devtools_frontend.cc
+++ b/content/shell/browser/shell_devtools_frontend.cc
@@ -63,9 +63,16 @@ ShellDevToolsFrontend* ShellDevToolsFrontend::Show(
   else
     shell->LoadURL(delegate->devtools_http_handler()->GetFrontendURL());
 
+  devtools_frontend->Activate();
+  devtools_frontend->Focus();
+
   return devtools_frontend;
 }
 
+void ShellDevToolsFrontend::Activate() {
+  frontend_shell_->ActivateContents(web_contents());
+}
+
 void ShellDevToolsFrontend::Focus() {
   web_contents()->GetView()->Focus();
 }