Send TestFinished as Process/Control-msg (not View-msg).

content/shell/browser/layout_test/layout_test_message_filter.cc

Index: content/shell/browser/layout_test/layout_test_message_filter.cc
diff --git a/content/shell/browser/layout_test/layout_test_message_filter.cc b/content/shell/browser/layout_test/layout_test_message_filter.cc
index 082fc238870acb9c151c4b01ea6852b70c05ce74..c5fb8517b87d12991caccf004f3b0fc5d5eafe3d 100644
--- a/content/shell/browser/layout_test/layout_test_message_filter.cc
+++ b/content/shell/browser/layout_test/layout_test_message_filter.cc
@@ -56,6 +56,7 @@ void LayoutTestMessageFilter::OverrideThreadForMessage(
     case LayoutTestHostMsg_SetPermission::ID:
     case LayoutTestHostMsg_ResetPermissions::ID:
     case LayoutTestHostMsg_LayoutTestRuntimeFlagsChanged::ID:
+    case LayoutTestHostMsg_TestFinishedInSecondaryRenderer::ID:
       *thread = BrowserThread::UI;
       break;
   }
@@ -80,6 +81,8 @@ bool LayoutTestMessageFilter::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(LayoutTestHostMsg_ResetPermissions, OnResetPermissions)
     IPC_MESSAGE_HANDLER(LayoutTestHostMsg_LayoutTestRuntimeFlagsChanged,
                         OnLayoutTestRuntimeFlagsChanged)
+    IPC_MESSAGE_HANDLER(LayoutTestHostMsg_TestFinishedInSecondaryRenderer,
+                        OnTestFinishedInSecondaryRenderer)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -193,4 +196,8 @@ void LayoutTestMessageFilter::OnLayoutTestRuntimeFlagsChanged(
       render_process_id_, changed_layout_test_runtime_flags);
 }
 
+void LayoutTestMessageFilter::OnTestFinishedInSecondaryRenderer() {
+  BlinkTestController::Get()->OnTestFinishedInSecondaryRenderer();
+}
+
 }  // namespace content