Make it possible to set the display mode from Chromium

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index 190545d1e8e51920cee75acfffbcc953f2e05d7e..152919297fe6e6069e04bf529a8f9e83bf1b6cb0 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -1237,6 +1237,10 @@ bool RenderViewHostImpl::IsFullscreen() const {
   return delegate_->IsFullscreenForCurrentTab();
 }
 
+blink::WebDisplayMode RenderViewHostImpl::GetDisplayMode() const {
+  return delegate_->GetDisplayMode();
+}
+
 void RenderViewHostImpl::OnFocus() {
   // Note: We allow focus and blur from swapped out RenderViewHosts, even when
   // the active RenderViewHost is in a different BrowsingInstance (e.g., WebUI).