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

content/browser/web_contents/web_contents_view_guest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_view_guest.h"
 
 #include <utility>
 
 #include "build/build_config.h"
 #include "content/browser/browser_plugin/browser_plugin_embedder.h"
@@ skipping 45 matching lines @@
   RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
   if (!rwhv)
     return NULL;
   return rwhv->GetNativeView();
 }
 
 gfx::NativeWindow WebContentsViewGuest::GetTopLevelNativeWindow() const {
   return guest_->embedder_web_contents()->GetTopLevelNativeWindow();
 }
 
+void WebContentsViewGuest::GetScreenInfo(
+    blink::WebScreenInfo* web_screen_info) const {
+  if (guest_->embedder_web_contents())
+  guest_->embedder_web_contents()->GetView()->GetScreenInfo(web_screen_info);

[oshima, 2016/07/29 18:11:46]

nit: indent

[wjmaclean, 2016/07/29 18:40:04]

Done.

+  else
+    WebContentsView::GetDefaultScreenInfo(web_screen_info);
+}
+
 void WebContentsViewGuest::OnGuestAttached(WebContentsView* parent_view) {
 #if defined(USE_AURA)
   // In aura, ScreenPositionClient doesn't work properly if we do
   // not have the native view associated with this WebContentsViewGuest in the
   // view hierarchy. We add this view as embedder's child here.
   // This would go in WebContentsViewGuest::CreateView, but that is too early to
   // access embedder_web_contents(). Therefore, we do it here.
   parent_view->GetNativeView()->AddChild(platform_view_->GetNativeView());
 #endif  // defined(USE_AURA)
 }
@@ skipping 158 matching lines @@
       embedder_render_view_host->GetDelegate()->GetDelegateView();
   if (view) {
     RecordAction(base::UserMetricsAction("BrowserPlugin.Guest.StartDrag"));
     view->StartDragging(drop_data, ops, image, image_offset, event_info);
   } else {
     embedder_web_contents->SystemDragEnded();
   }
 }
 
 }  // namespace content