[Android] Add support for a hung renderer dialog

chrome/browser/android/hung_renderer_infobar_delegate.cc

+// 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.
+
+#include "chrome/browser/android/hung_renderer_infobar_delegate.h"
+
+#include "base/callback.h"
+#include "chrome/grit/generated_resources.h"
+#include "components/infobars/core/infobar.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/common/result_codes.h"
+#include "grit/theme_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+
+HungRendererInfoBarDelegate::HungRendererInfoBarDelegate(
+    content::WebContents* web_contents)
+    : web_contents_(web_contents) {

[jdduke (slow), 2015/08/18 17:39:29]

There's not much code here, I thought of just embedding this class directly in
tab_android.cc...

[gone, 2015/08/18 18:21:36]

Eh, the less things we shove into TabAndroid the better.  Tab and its native
counterpart are like black holes.

+  DCHECK(web_contents);
+}
+
+HungRendererInfoBarDelegate::~HungRendererInfoBarDelegate() {}
+
+int HungRendererInfoBarDelegate::GetIconID() const {
+  return IDR_FROZEN_TAB_ICON;
+}
+
+base::string16 HungRendererInfoBarDelegate::GetMessageText() const {
+  return l10n_util::GetPluralStringFUTF16(IDS_BROWSER_HANGMONITOR_RENDERER, 1);
+}
+
+base::string16 HungRendererInfoBarDelegate::GetButtonLabel(
+    InfoBarButton button) const {
+  return l10n_util::GetStringUTF16((button == BUTTON_OK)
+                                       ? IDS_BROWSER_HANGMONITOR_RENDERER_END
+                                       : IDS_BROWSER_HANGMONITOR_RENDERER_WAIT);
+}
+
+bool HungRendererInfoBarDelegate::Accept() {
+  content::RenderProcessHost* process = web_contents_->GetRenderProcessHost();
+  process->Shutdown(content::RESULT_CODE_HUNG, false);
+  return true;
+}