[content shell] only instantiate webkit test runners for layout tests

BUG=173456,173079
R=marja@chromium.org

Review URL: https://codereview.chromium.org/12114046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180120 0039d316-1c4b-4281-b951-d872f2087c98

content/shell/shell_content_renderer_client.cc

@@ -56,6 +56,8 @@ void ShellContentRendererClient::RenderThreadStarted() {
 }
 
 void ShellContentRendererClient::RenderViewCreated(RenderView* render_view) {
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree))
+    return;
   WebKitTestRunner* test_runner = new WebKitTestRunner(render_view);
   if (!ShellRenderProcessObserver::GetInstance()->test_delegate()) {
     ShellRenderProcessObserver::GetInstance()->SetMainWindow(render_view,