Reland of OOPIF: Route keyboard events to focused frame in the browser process.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 6b1407b78e0ace939218a24a5478b0c23d48f1c3..f866c138d167035c173c9e997937244420004ce0 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1590,6 +1590,18 @@
   frame_tree_.ReplicatePageFocus(is_focused);
 }
 
+RenderWidgetHostImpl* WebContentsImpl::GetFocusedRenderWidgetHost() {
+  if (!SiteIsolationPolicy::AreCrossProcessFramesPossible())
+    return GetMainFrame()->GetRenderWidgetHost();
+
+  FrameTreeNode* focused_frame = frame_tree_.GetFocusedFrame();
+  if (!focused_frame)
+    return GetMainFrame()->GetRenderWidgetHost();
+
+  return RenderWidgetHostImpl::From(
+      focused_frame->current_frame_host()->GetView()->GetRenderWidgetHost());
+}
+
 void WebContentsImpl::EnterFullscreenMode(const GURL& origin) {
   // This method is being called to enter renderer-initiated fullscreen mode.
   // Make sure any existing fullscreen widget is shut down first.