Backfill some UI tests.

content/test/test_render_view_host.cc

Index: content/test/test_render_view_host.cc
diff --git a/content/test/test_render_view_host.cc b/content/test/test_render_view_host.cc
index ece1a637fb4177cc712b0a947f755e58d90785ca..527fac259ae79809673e559cd3bdc60d79a73ebf 100644
--- a/content/test/test_render_view_host.cc
+++ b/content/test/test_render_view_host.cc
@@ -30,8 +30,13 @@
 #include "media/base/video_frame.h"
 #include "ui/aura/env.h"
 #include "ui/compositor/compositor.h"
+#include "ui/compositor/layer_type.h"
 #include "ui/gfx/geometry/rect.h"
 
+#if defined(USE_AURA)
+#include "ui/aura/test/test_window_delegate.h"
+#endif
+
 namespace content {
 
 void InitNavigateParams(FrameHostMsg_DidCommitProvisionalLoad_Params* params,
@@ -73,6 +78,13 @@ TestRenderWidgetHostView::TestRenderWidgetHostView(RenderWidgetHost* rwh)
 #endif
 
   rwh_->SetView(this);
+
+#if defined(USE_AURA)
+  window_.reset(new aura::Window(
+      aura::test::TestWindowDelegate::CreateSelfDestroyingDelegate()));
+  window_->set_owned_by_parent(false);
+  window_->Init(ui::LayerType::LAYER_NOT_DRAWN);
+#endif
 }
 
 TestRenderWidgetHostView::~TestRenderWidgetHostView() {
@@ -91,7 +103,11 @@ gfx::Vector2dF TestRenderWidgetHostView::GetLastScrollOffset() const {
 }
 
 gfx::NativeView TestRenderWidgetHostView::GetNativeView() const {
+#if defined(USE_AURA)
+  return window_.get();
+#else
   return nullptr;
+#endif
 }
 
 gfx::NativeViewAccessible TestRenderWidgetHostView::GetNativeViewAccessible() {