Fix keyboard focus for OOPIF-<webview>.

content/public/test/browser_test_utils.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/test/browser_test_utils.h"
 
 #include <stddef.h>
 #include <tuple>
 #include <utility>
 
@@ skipping 1489 matching lines @@
   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
     RunTaskOnIOThreadAndWait(base::Bind(&BrowserTestClipboardScope::SetText,
                                         base::Unretained(this), text));
     return;
   }
 #endif
   ui::ScopedClipboardWriter clipboard_writer(ui::CLIPBOARD_TYPE_COPY_PASTE);
   clipboard_writer.WriteText(base::ASCIIToUTF16(text));
 }
 
+class FrameFocusedObserver::FrameTreeNodeObserverImpl
+    : public FrameTreeNode::Observer {
+ public:
+  explicit FrameTreeNodeObserverImpl(FrameTreeNode* owner)
+      : owner_(owner), message_loop_runner_(new MessageLoopRunner) {
+    owner->AddObserver(this);
+  }
+  ~FrameTreeNodeObserverImpl() override { owner_->RemoveObserver(this); }
+
+  void Run() { message_loop_runner_->Run(); }
+
+  void OnFrameTreeNodeFocused(FrameTreeNode* node) override {
+    if (node == owner_)
+      message_loop_runner_->Quit();
+  }
+
+ private:
+  FrameTreeNode* owner_;
+  scoped_refptr<MessageLoopRunner> message_loop_runner_;
+};
+
+FrameFocusedObserver::FrameFocusedObserver(RenderFrameHost* owner_host)
+    : impl_(new FrameTreeNodeObserverImpl(
+          static_cast<RenderFrameHostImpl*>(owner_host)->frame_tree_node())) {}
+
+FrameFocusedObserver::~FrameFocusedObserver() {}
+
+void FrameFocusedObserver::Wait() {
+  impl_->Run();
+}
+
 }  // namespace content