Implement WebContentsViewChildFrame::TakeFocus.

content/browser/web_contents/web_contents_view_child_frame.cc

Index: content/browser/web_contents/web_contents_view_child_frame.cc
diff --git a/content/browser/web_contents/web_contents_view_child_frame.cc b/content/browser/web_contents/web_contents_view_child_frame.cc
index 9b17012781b3864279b2473a25ca08ae97a6c877..73d53fbed57547b4c63944c4b688aaa3f47a5378 100644
--- a/content/browser/web_contents/web_contents_view_child_frame.cc
+++ b/content/browser/web_contents/web_contents_view_child_frame.cc
@@ -5,6 +5,7 @@
 #include "content/browser/web_contents/web_contents_view_child_frame.h"
 
 #include "build/build_config.h"
+#include "content/browser/frame_host/render_frame_proxy_host.h"
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/web_contents_view_delegate.h"
@@ -152,8 +153,17 @@ void WebContentsViewChildFrame::GotFocus() {
 }
 
 void WebContentsViewChildFrame::TakeFocus(bool reverse) {
-  // TODO(avallee): http://crbug.com/610819 Advance focus to next element in
-  // outer WebContents.
+  RenderFrameProxyHost* rfp = web_contents_->GetMainFrame()
+                                  ->frame_tree_node()
+                                  ->render_manager()
+                                  ->GetProxyToOuterDelegate();
+  FrameTreeNode* outer_node = FrameTreeNode::GloballyFindByID(
+      web_contents_->GetOuterDelegateFrameTreeNodeId());
+  RenderFrameHostImpl* rfhi =
+      outer_node->parent()->render_manager()->current_frame_host();
+
+  rfhi->AdvanceFocus(
+      reverse ? blink::WebFocusTypeBackward : blink::WebFocusTypeForward, rfp);
 }
 
 void WebContentsViewChildFrame::ShowContextMenu(