Abstract WebContentsObserver from Autofill shared code

components/autofill/content/browser/autofill_driver.h

Index: components/autofill/content/browser/autofill_driver.h
diff --git a/components/autofill/content/browser/autofill_driver.h b/components/autofill/content/browser/autofill_driver.h
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+++ b/components/autofill/content/browser/autofill_driver.h
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+// Copyright 2013 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 COMPONENTS_AUTOFILL_CONTENT_BROWSER_AUTOFILL_DRIVER_H_
+#define COMPONENTS_AUTOFILL_CONTENT_BROWSER_AUTOFILL_DRIVER_H_
+
+#include <string>
+
+#include "base/supports_user_data.h"
+#include "components/autofill/browser/autofill_manager.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace IPC {
+class Message;
+}
+
+namespace autofill {
+
+class AutofillExternalDelegate;
+class AutofillManager;
+class AutofillManagerDelegate;
+
+// Class that drives autofill flow in the browser process based on
+// communication from the renderer and from the external world. There is one
+// instance per WebContents.
+class AutofillDriver : public content::WebContentsObserver,
+                       public base::SupportsUserData::Data {
+ public:
+  static void CreateForWebContentsAndDelegate(
+      content::WebContents* contents,
+      autofill::AutofillManagerDelegate* delegate,
+      const std::string& app_locale,
+      AutofillManager::AutofillDownloadManagerState enable_download_manager,
+      bool enable_native_UI);
+  static AutofillDriver* FromWebContents(content::WebContents* contents);
+
+ private:
+  AutofillDriver(
+      content::WebContents* web_contents,
+      autofill::AutofillManagerDelegate* delegate,
+      const std::string& app_locale,
+      AutofillManager::AutofillDownloadManagerState enable_download_manager,
+      bool enable_native_UI);
+  virtual ~AutofillDriver();
+
+  // content::WebContentsObserver:
+  virtual void DidNavigateMainFrame(
+      const content::LoadCommittedDetails& details,
+      const content::FrameNavigateParams& params) OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  AutofillManager* autofill_manager_;
+  AutofillExternalDelegate* autofill_external_delegate_;
+};
+
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_CONTENT_BROWSER_AUTOFILL_DRIVER_H_