Make it possible to set the display mode from Chromium

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index fe0203ff98f81e007b0d7e22aaa10b0bd7048e96..247667b7c9781227ff6b44dd8f78f1c1dbe4ffa2 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -594,7 +594,10 @@ bool RenderWidgetHostImpl::GetResizeParams(
     resize_params->top_controls_shrink_blink_size =
         view_->DoTopControlsShrinkBlinkSize();
     resize_params->visible_viewport_size = view_->GetVisibleViewportSize();
+    // TODO: 'is_fullscreen' is not a correct name here,
+    // see crbug.com/474765.
     resize_params->is_fullscreen = IsFullscreen();
+    resize_params->display_mode = GetDisplayMode();
   }
 
   const bool size_changed =
@@ -607,6 +610,7 @@ bool RenderWidgetHostImpl::GetResizeParams(
       old_resize_params_->physical_backing_size !=
           resize_params->physical_backing_size ||
       old_resize_params_->is_fullscreen != resize_params->is_fullscreen ||
+      old_resize_params_->display_mode != resize_params->display_mode ||
       old_resize_params_->top_controls_height !=
           resize_params->top_controls_height ||
       old_resize_params_->top_controls_shrink_blink_size !=
@@ -1321,6 +1325,10 @@ bool RenderWidgetHostImpl::IsFullscreen() const {
   return false;
 }
 
+blink::WebDisplayMode RenderWidgetHostImpl::GetDisplayMode() const {
+  return blink::WebDisplayModeBrowser;
+}
+
 void RenderWidgetHostImpl::SetAutoResize(bool enable,
                                          const gfx::Size& min_size,
                                          const gfx::Size& max_size) {