Fix keyboard focus for OOPIF-<webview>.

content/public/test/browser_test_utils.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_
 #define CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_
 
 #include <queue>
 #include <string>
 #include <vector>
@@ skipping 556 matching lines @@
   // Puts text/rtf |rtf| on the clipboard.
   void SetRtf(const std::string& rtf);
 
   // Puts plain text |text| on the clipboard.
   void SetText(const std::string& text);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserTestClipboardScope);
 };
 
+// This observer is used to wait for its owner Frame to become focused.
+class FrameFocusedObserver {
+  // Private impl struct which hides non public types including FrameTreeNode.
+  class FrameTreeNodeObserverImpl;
+
+ public:
+  explicit FrameFocusedObserver(RenderFrameHost* owner_host);
+  ~FrameFocusedObserver();
+
+  void Wait();
+
+ private:
+  // FrameTreeNode::Observer
+  std::unique_ptr<FrameTreeNodeObserverImpl> impl_;
+
+  DISALLOW_COPY_AND_ASSIGN(FrameFocusedObserver);
+};
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_