Service CreateNewWindow on the UI thread with a new mojo interface

content/test/test_render_frame.cc

Index: content/test/test_render_frame.cc
diff --git a/content/test/test_render_frame.cc b/content/test/test_render_frame.cc
index 6c0bb0133b81b4af5f5e4e615a24e6bb8f48f943..812b48780741e1f074bccceb3e6863013d83d9d7 100644
--- a/content/test/test_render_frame.cc
+++ b/content/test/test_render_frame.cc
@@ -4,14 +4,42 @@
 
 #include "content/test/test_render_frame.h"
 
+#include "base/memory/ptr_util.h"
 #include "content/common/navigation_params.h"
 #include "content/common/resource_request_body_impl.h"
+#include "content/public/common/associated_interface_provider.h"
 #include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/common/resource_response.h"
+#include "content/public/test/mock_render_thread.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 
 namespace content {
 
+class MockFrameHostIPC : public mojom::FrameHostIPC {
+ public:
+  MockFrameHostIPC() : binding_(this) {}
+  ~MockFrameHostIPC() override = default;
+
+  void CreateNewWindow(mojom::CreateNewWindowParamsPtr params,
+                       const CreateNewWindowCallback& callback) override {
+    mojom::CreateNewWindowReplyPtr reply = mojom::CreateNewWindowReply::New();
+    MockRenderThread* mock_render_thread =
+        static_cast<MockRenderThread*>(RenderThread::Get());
+    mock_render_thread->OnCreateWindow(*params, reply.get());
+    callback.Run(std::move(reply));
+  }
+
+  void Bind(mojo::ScopedInterfaceEndpointHandle handle) {
+    binding_.Bind(
+        mojo::MakeAssociatedRequest<mojom::FrameHostIPC>(std::move(handle)));
+  }
+
+ private:
+  mojo::AssociatedBinding<mojom::FrameHostIPC> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockFrameHostIPC);
+};
+
 // static
 RenderFrameImpl* TestRenderFrame::CreateTestRenderFrame(
     const RenderFrameImpl::CreateParams& params) {
@@ -19,7 +47,12 @@ RenderFrameImpl* TestRenderFrame::CreateTestRenderFrame(
 }
 
 TestRenderFrame::TestRenderFrame(const RenderFrameImpl::CreateParams& params)
-    : RenderFrameImpl(params) {
+    : RenderFrameImpl(params),
+      mock_frame_host_ipc_(base::MakeUnique<MockFrameHostIPC>()) {
+  GetRemoteAssociatedInterfaces()->OverrideBinderForTesting(
+      mojom::FrameHostIPC::Name_,
+      base::Bind(&MockFrameHostIPC::Bind,
+                 base::Unretained(mock_frame_host_ipc_.get())));
 }
 
 TestRenderFrame::~TestRenderFrame() {