Fix keyboard focus for OOPIF-<webview>.

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
diff --git a/content/browser/frame_host/render_frame_host_delegate.h b/content/browser/frame_host/render_frame_host_delegate.h
index 9054ea9f36cc48e926d67d46abe957dd11b7ad7a..5048649eecd608a1a4812d8778bde06c8b1efa58 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -30,6 +30,7 @@ class Message;
 }
 
 namespace content {
+class FrameTreeNode;
 class GeolocationServiceContext;
 class InterstitialPage;
 class PageState;
@@ -179,6 +180,11 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   // https://crbug.com/330264.
   virtual void EnsureOpenerProxiesExist(RenderFrameHost* source_rfh) {}
 
+  // Set the |node| frame as focused in the current FrameTree as well as
+  // possibly changing focus in distinct but related FrameTrees (Guest, Embedder
+  // with separate tree).
+  virtual void SetFocusedFrame(FrameTreeNode* node, SiteInstance* source) {}
+
   // Creates a WebUI object for a frame navigating to |url|. If no WebUI
   // applies, returns null.
   virtual std::unique_ptr<WebUIImpl> CreateWebUIForRenderFrameHost(