Backfill some UI tests.

content/test/test_render_view_host.h

Index: content/test/test_render_view_host.h
diff --git a/content/test/test_render_view_host.h b/content/test/test_render_view_host.h
index 9bbee7414f7423d21581dbee832ec0eddc195e40..b923434ed6ad620adcab791bafdf5bd1d930b975 100644
--- a/content/test/test_render_view_host.h
+++ b/content/test/test_render_view_host.h
@@ -24,6 +24,10 @@
 #include "ui/base/page_transition_types.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
+#if defined(USE_AURA)
+#include "ui/aura/window.h"
+#endif
+
 // This file provides a testing framework for mocking out the RenderProcessHost
 // layer. It allows you to test RenderViewHost, WebContentsImpl,
 // NavigationController, and other layers above that without running an actual
@@ -61,7 +65,7 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase {
   explicit TestRenderWidgetHostView(RenderWidgetHost* rwh);
   ~TestRenderWidgetHostView() override;
 
-  // RenderWidgetHostView implementation.
+  // RenderWidgetHostView:
   void InitAsChild(gfx::NativeView parent_view) override {}
   RenderWidgetHost* GetRenderWidgetHost() const override;
   void SetSize(const gfx::Size& size) override {}
@@ -96,7 +100,7 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase {
   void ClearCompositorFrame() override {}
   void SetNeedsBeginFrames(bool needs_begin_frames) override {}
 
-  // RenderWidgetHostViewBase implementation.
+  // RenderWidgetHostViewBase:
   void InitAsPopup(RenderWidgetHostView* parent_host_view,
                    const gfx::Rect& bounds) override {}
   void InitAsFullscreen(RenderWidgetHostView* reference_host_view) override {}
@@ -135,6 +139,10 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase {
   bool did_change_compositor_frame_sink_ = false;
   SkColor background_color_;
   ui::DummyTextInputClient text_input_client_;
+
+#if defined(USE_AURA)
+  std::unique_ptr<aura::Window> window_;
+#endif
 };
 
 #if defined(COMPILER_MSVC)