<webview>: Zooming the embedder should zoom the guest by the same level.

extensions/browser/guest_view/web_view/web_view_guest_delegate.h

Index: extensions/browser/guest_view/web_view/web_view_guest_delegate.h
diff --git a/extensions/browser/guest_view/web_view/web_view_guest_delegate.h b/extensions/browser/guest_view/web_view/web_view_guest_delegate.h
index f8a2dbf65060cb61901db730ca9fff34cfcde036..2e2722709cc75071c0300b2ba5fc64fcbcd49f82 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest_delegate.h
+++ b/extensions/browser/guest_view/web_view/web_view_guest_delegate.h
@@ -43,6 +43,10 @@ class WebViewGuestDelegate {
   // Called to perform some cleanup prior to destruction.
   virtual void OnEmbedderDestroyed() = 0;
 
+  // Called after the guest has been attached to an embedder and suspended
+  // resource loads have been resumed.
+  virtual void OnDidAttachToEmbedder() = 0;
+
   // Called when the guest WebContents commits a provisional load in any frame.
   virtual void OnDidCommitProvisionalLoadForFrame(bool is_main_frame) = 0;