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 c1cb9fb65c9afabba75009c352e6d83dd11cd6ec..1727ac1658325c160909f66e57087039982405e5 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;
@@ -184,6 +185,10 @@ 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 inner/outer WebContents.
+  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(