Add a factory function to create WebContentsView implementations.

content/browser/web_contents/web_contents_view_android.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/browser/web_contents/web_contents_view_android.h"
 
 #include "base/logging.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+
+namespace content {
+WebContentsView* CreateWebContentsView(WebContentsImpl* web_contents,
+                                       WebContentsViewDelegate* delegate) {
+  return new WebContentsViewAndroid(web_contents);
+}
+}
 
 WebContentsViewAndroid::WebContentsViewAndroid(
     content::WebContents* web_contents)
     : web_contents_(web_contents) {
 }
 
 WebContentsViewAndroid::~WebContentsViewAndroid() {
 }
 
 void WebContentsViewAndroid::CreateView(const gfx::Size& initial_size) {
@@ skipping 143 matching lines @@
   NOTIMPLEMENTED();
 }
 
 void WebContentsViewAndroid::GotFocus() {
   NOTIMPLEMENTED();
 }
 
 void WebContentsViewAndroid::TakeFocus(bool reverse) {
   NOTIMPLEMENTED();
 }