[Android] Add support for a hung renderer dialog

chrome/browser/android/hung_renderer_infobar_delegate.h

+// Copyright 2015 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 CHROME_BROWSER_ANDROID_HUNG_RENDERER_INFOBAR_DELEGATE_H_
+#define CHROME_BROWSER_ANDROID_HUNG_RENDERER_INFOBAR_DELEGATE_H_
+
+#include "components/infobars/core/confirm_infobar_delegate.h"
+
+namespace content {
+class WebContent;
+}
+
+// This class is responsible for customizing a hung renderer infobar.
+// If the "kill" dialog is clicked, the renderer of the corresponding
+// WebContents will be shutdown.
+class HungRendererInfoBarDelegate : public ConfirmInfoBarDelegate {
+ public:
+  // The caller must ensure that |web_contents| outlives the delegate.
+  // This will naturally occur if the associated InfoBar is managed by the
+  // InfoBarService.
+  explicit HungRendererInfoBarDelegate(content::WebContents* web_contents);
+  ~HungRendererInfoBarDelegate() override;
+
+  // InfoBarDelegate:
+  void InfoBarDismissed() override;
+  HungRendererInfoBarDelegate* AsHungRendererInfoBarDelegate() override;
+
+  // ConfirmInfoBarDelegate:
+  int GetIconID() const override;
+  base::string16 GetMessageText() const override;
+  base::string16 GetButtonLabel(InfoBarButton button) const override;
+  bool Accept() override;
+  bool Cancel() override;
+
+  // Called when the renderer regains responsiveness before the dialog is
+  // dismissed.
+  void OnRendererResponsive();
+
+ private:
+  // Keep these values in alignment with their histograms.xml counterparts.
+  enum Action { WAIT = 0, KILL, DISMISS, RESPONSIVE, REMOVE, ACTION_COUNT };
+  void LogAction(Action action);
+
+  content::WebContents* web_contents_;
+
+  bool action_logged_for_uma_;
+
+  DISALLOW_COPY_AND_ASSIGN(HungRendererInfoBarDelegate);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_HUNG_RENDERER_INFOBAR_DELEGATE_H_