Explicitly initialize secondary renderers for layout tests.

content/shell/renderer/layout_test/blink_test_runner.cc

Index: content/shell/renderer/layout_test/blink_test_runner.cc
diff --git a/content/shell/renderer/layout_test/blink_test_runner.cc b/content/shell/renderer/layout_test/blink_test_runner.cc
index 8ebd8627cae2d79483179422f0ba588adf46e655..6c78e11262cc9e8b6ef86c51252c3d7ddf4ef7bb 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.cc
+++ b/content/shell/renderer/layout_test/blink_test_runner.cc
@@ -744,15 +744,6 @@ bool BlinkTestRunner::OnMessageReceived(const IPC::Message& message) {
 
 void BlinkTestRunner::Navigate(const GURL& url) {
   focus_on_next_commit_ = true;
-  if (!is_main_window_ &&
-      LayoutTestRenderThreadObserver::GetInstance()->main_test_runner() ==
-          this) {
-    test_runner::WebTestInterfaces* interfaces =
-        LayoutTestRenderThreadObserver::GetInstance()->test_interfaces();
-    interfaces->SetTestIsRunning(true);
-    interfaces->ConfigureForTestWithURL(GURL(), false);
-    ForceResizeRenderView(render_view(), WebSize(800, 600));
-  }
 }
 
 void BlinkTestRunner::DidCommitProvisionalLoad(WebLocalFrame* frame,
@@ -904,6 +895,16 @@ BlinkTestRunner::GetBluetoothFakeAdapterSetter() {
   return *bluetooth_fake_adapter_setter_;
 }
 
+void BlinkTestRunner::OnSetupSecondaryRenderer() {
+  DCHECK(!is_main_window_);
+
+  test_runner::WebTestInterfaces* interfaces =
+      LayoutTestRenderThreadObserver::GetInstance()->test_interfaces();
+  interfaces->SetTestIsRunning(true);
+  interfaces->ConfigureForTestWithURL(GURL(), false);
+  ForceResizeRenderView(render_view(), WebSize(800, 600));
+}
+
 void BlinkTestRunner::OnReplicateTestConfiguration(
     const ShellTestConfiguration& params) {
   test_config_ = params;