Add occlusion support to WebContentsImpl and RenderWidgetHostView

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 c086a8a197504725f7225a67354f32f902e2f011..6769357858515ddd2531b1e68df4fa046d60d87b 100644
--- a/content/test/test_render_view_host.h
+++ b/content/test/test_render_view_host.h
@@ -69,6 +69,8 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase {
   void Show() override;
   void Hide() override;
   bool IsShowing() override;
+  void WasUnOccluded() override;
+  void WasOccluded() override;
   gfx::Rect GetViewBounds() const override;
 #if defined(OS_MACOSX)
   void SetActive(bool active) override;
@@ -137,6 +139,7 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase {
 #endif
 
   bool is_showing() const { return is_showing_; }
+  bool is_occluded() const { return is_occluded_; }
   bool did_swap_compositor_frame() const { return did_swap_compositor_frame_; }
 
  protected:
@@ -144,6 +147,7 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase {
 
  private:
   bool is_showing_;
+  bool is_occluded_;
   bool did_swap_compositor_frame_;
   ui::DummyTextInputClient text_input_client_;
 };