Cross-process frames should be notified of device scale factor changes.

content/browser/web_contents/web_contents_view_mus.cc

Index: content/browser/web_contents/web_contents_view_mus.cc
diff --git a/content/browser/web_contents/web_contents_view_mus.cc b/content/browser/web_contents/web_contents_view_mus.cc
index 98700f023cee59467354c14dc7c53bf86c89f0c6..f5527d390d486a875fc1df2e56b81181f0f29f6c 100644
--- a/content/browser/web_contents/web_contents_view_mus.cc
+++ b/content/browser/web_contents/web_contents_view_mus.cc
@@ -62,6 +62,11 @@ gfx::NativeWindow WebContentsViewMus::GetTopLevelNativeWindow() const {
   return window ? window : delegate_->GetNativeWindow();
 }
 
+void WebContentsViewMus::GetScreenInfo(
+    blink::WebScreenInfo* web_screen_info) const {
+  // TODO(wjmaclean) Figure out what goes here.
+}
+
 void WebContentsViewMus::GetContainerBounds(gfx::Rect* out) const {
   *out = aura_window_->GetBoundsInScreen();
 }