Add support for invoking the Windows 8 metro style hung renderer dialog box. The dialog box

chrome/browser/ui/views/hung_renderer_view_win.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 "chrome/browser/ui/views/hung_renderer_view_win.h"
 
+#include "base/win/metro.h"
+#include "chrome/browser/hang_monitor/hang_crash_dump_win.h"
+#include "chrome/browser/ui/views/hung_renderer_view.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_process_host.h"
+#include "grit/generated_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+
+// Metro functions for displaying and dismissing a dialog box.
+typedef void (*MetroShowDialogBox)(
+    const wchar_t* title,
+    const wchar_t* content,
+    const wchar_t* button1_label,
+    const wchar_t* button2_label,
+    base::win::MetroDialogButtonPressedHandler button1_handler,
+    base::win::MetroDialogButtonPressedHandler button2_handler);
+
+typedef void (*MetroDismissDialogBox)();
+
+using content::BrowserThread;
+using content::WebContents;
+
+HungRendererDialogMetro* HungRendererDialogMetro::g_instance_ = NULL;
+
+bool PlatformShowCustomHungRendererDialog(WebContents* contents) {
+  if (!base::win::IsMetroProcess())
+    return false;
+
+  HungRendererDialogMetro::Create()->Show(contents);
+  return true;
+}
+
+bool PlatformHideCustomHungRendererDialog(WebContents* contents) {
+  if (!base::win::IsMetroProcess())
+    return false;
+
+  if (HungRendererDialogMetro::GetInstance())
+    HungRendererDialogMetro::GetInstance()->Hide(contents);
+  return true;
+}
+
 // static
-HungRendererDialogView* HungRendererDialogView::Create() {
-  if (!g_instance_)
-    g_instance_ = new HungRendererDialogViewWin();
+void HungRendererDialogView::KillRendererProcess(
+    base::ProcessHandle process_handle) {
+  // Try to generate a crash report for the hung process.
+  CrashDumpAndTerminateHungChildProcess(process_handle);
+}
+
+// static
+HungRendererDialogMetro* HungRendererDialogMetro::Create() {
+  if (!GetInstance())
+    g_instance_ = new HungRendererDialogMetro;
   return g_instance_;
 }
 
-void HungRendererDialogViewWin::ShowForWebContents(WebContents* contents) {
-  HungRendererDialogView::ShowForWebContents(contents);
+// static
+HungRendererDialogMetro* HungRendererDialogMetro::GetInstance() {
+  return g_instance_;
 }
 
-void HungRendererDialogViewWin::EndForWebContents(WebContents* contents) {
-  HungRendererDialogView::EndForWebContents(contents);
+HungRendererDialogMetro::HungRendererDialogMetro()
+    : contents_(NULL),
+      metro_dialog_displayed_(false) {
 }
+
+HungRendererDialogMetro::~HungRendererDialogMetro() {
+}
+
+void HungRendererDialogMetro::Show(WebContents* contents) {
+  if (!metro_dialog_displayed_ &&
+      HungRendererDialogView::IsFrameActive(contents)) {
+    HMODULE metro_dll = base::win::GetMetroModule();
+    DCHECK(metro_dll);
+    if (metro_dll) {
+      MetroShowDialogBox show_dialog_box = reinterpret_cast<MetroShowDialogBox>
+          (::GetProcAddress(metro_dll, "ShowDialogBox"));
+      DCHECK(show_dialog_box);
+      if (show_dialog_box) {
+        string16 dialog_box_title =
+            l10n_util::GetStringUTF16(IDS_BROWSER_HANGMONITOR_RENDERER_TITLE);
+
+        string16 kill_button_label =
+            l10n_util::GetStringUTF16(IDS_BROWSER_HANGMONITOR_RENDERER_END);
+
+        string16 wait_button_label =
+            l10n_util::GetStringUTF16(IDS_BROWSER_HANGMONITOR_RENDERER_WAIT);
+
+        contents_ = contents;
+        metro_dialog_displayed_ = true;
+
+        (*show_dialog_box)(dialog_box_title.c_str(),
+                           contents->GetTitle().c_str(),
+                           kill_button_label.c_str(),
+                           wait_button_label.c_str(),
+                           HungRendererDialogMetro::OnMetroKillProcess,
+                           HungRendererDialogMetro::OnMetroWait);
+      }
+    }
+  }
+}
+
+void HungRendererDialogMetro::Hide(WebContents* contents) {
+  HMODULE metro_dll = base::win::GetMetroModule();
+  DCHECK(metro_dll);
+  if (metro_dll) {
+    MetroDismissDialogBox dismiss_dialog_box =
+        reinterpret_cast<MetroDismissDialogBox>
+            (::GetProcAddress(metro_dll, "DismissDialogBox"));
+    DCHECK(dismiss_dialog_box);
+    if (dismiss_dialog_box) {
+      (*dismiss_dialog_box)();
+      ResetMetroState();
+    }
+  }
+}
+
+void HungRendererDialogMetro::ResetMetroState() {
+  metro_dialog_displayed_ = false;
+  contents_ = NULL;
+  delete g_instance_;
+  g_instance_ = NULL;

[sky, 2012/07/24 23:40:33]

move resetting g_instance_ to the destructor (safer). And since you're deleting
you don't really need to reset the other fields.

[ananta, 2012/07/24 23:45:15]

Done.

+}
+
+// static
+void HungRendererDialogMetro::OnMetroKillProcess() {
+  // Metro chrome will invoke these handlers on the metro thread. Ensure that
+  // we switch to the UI thread.
+  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(HungRendererDialogMetro::OnMetroKillProcess));
+    return;
+  }
+
+  DCHECK(GetInstance());

[sky, 2012/07/24 23:40:33]

I think you should just return here. I could see timing problems triggering
this.

[ananta, 2012/07/24 23:45:15]

Done.

+  DCHECK(GetInstance()->contents_);
+
+  HungRendererDialogView::KillRendererProcess(
+      GetInstance()->contents_->GetRenderProcessHost()->GetHandle());
+
+  // The metro dialog box is dismissed when the button handlers are invoked.
+  GetInstance()->ResetMetroState();
+}
+
+// static
+void HungRendererDialogMetro::OnMetroWait() {
+  // Metro chrome will invoke these handlers on the metro thread. Ensure that
+  // we switch to the UI thread.
+  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(HungRendererDialogMetro::OnMetroWait));
+    return;
+  }
+
+  DCHECK(GetInstance());

[sky, 2012/07/24 23:40:33]

Same comment here, just return if no instance.

[ananta, 2012/07/24 23:45:15]

Done.

+  GetInstance()->ResetMetroState();
+}