This change modifies behavior of crash dialog in case of aura metro.

chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.cc

 // Copyright 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/metro_viewer/chrome_metro_viewer_process_host_aurawin.h"
 
 #include "ash/shell.h"
+#include "base/environment.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string_number_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_process_platform_part_aurawin.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/search_engines/util.h"
 #include "chrome/browser/ui/ash/ash_init.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/common/env_vars.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/page_navigator.h"
 #include "content/public/browser/web_contents.h"
 #include "ui/aura/remote_root_window_host_win.h"
 #include "ui/surface/accelerated_surface_win.h"
 #include "url/gurl.h"
 
 namespace {
 
@@ skipping 28 matching lines @@
     : MetroViewerProcessHost(
           content::BrowserThread::GetMessageLoopProxyForThread(
               content::BrowserThread::IO)) {
   g_browser_process->AddRefModule();
 }
 
 void  ChromeMetroViewerProcessHost::OnChannelError() {
   // TODO(cpu): At some point we only close the browser. Right now this
   // is very convenient for developing.
   DLOG(INFO) << "viewer channel error : Quitting browser";
+
+  // Set environment variable to let breakpad know that metro process wasn't
+  // connected.
+  scoped_ptr<base::Environment> env(base::Environment::Create());

[cpu_(ooo_6.6-7.5), 2013/08/27 17:40:37]

don't use this method, just call the windows api directly or I think there might
another simpler wrapper in base.

[Shrikant Kelkar, 2013/08/27 22:29:30]

Done.

+  env->UnSetVar(env_vars::kMetroConnected);
+
   aura::RemoteRootWindowHostWin::Instance()->Disconnected();
   g_browser_process->ReleaseModule();
   CloseOpenAshBrowsers();
   chrome::CloseAsh();
   // Tell the rest of Chrome about it.
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_ASH_SESSION_ENDED,
       content::NotificationService::AllSources(),
       content::NotificationService::NoDetails());
 
   // This will delete the MetroViewerProcessHost object. Don't access member
   // variables/functions after this call.
   g_browser_process->platform_part()->OnMetroViewerProcessTerminated();
 }
 
+void  ChromeMetroViewerProcessHost::OnChannelConnected(int32 /*peer_pid*/) {
+  DLOG(INFO) << "ChromeMetroViewerProcessHost::OnChannelConnected: ";
+  // Set environment variable to let breakpad know that metro process was
+  // connected.
+  scoped_ptr<base::Environment> env(base::Environment::Create());
+  env->SetVar(env_vars::kMetroConnected, "1");
+}
+
 void ChromeMetroViewerProcessHost::OnSetTargetSurface(
     gfx::NativeViewId target_surface) {
   DLOG(INFO) << __FUNCTION__ << ", target_surface = " << target_surface;
   HWND hwnd = reinterpret_cast<HWND>(target_surface);
   chrome::OpenAsh();
   scoped_refptr<AcceleratedPresenter> any_window =
       AcceleratedPresenter::GetForWindow(NULL);
   any_window->SetNewTargetWindow(hwnd);
   aura::RemoteRootWindowHostWin::Instance()->Connected(this);
   ash::Shell::GetInstance()->CreateLauncher();
   ash::Shell::GetInstance()->ShowLauncher();
   // Tell the rest of Chrome that Ash is running.
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_ASH_SESSION_STARTED,
       content::NotificationService::AllSources(),
       content::NotificationService::NoDetails());
 }
 
 void ChromeMetroViewerProcessHost::OnOpenURL(const string16& url) {
   OpenURL(GURL(url));
 }
 
 void ChromeMetroViewerProcessHost::OnHandleSearchRequest(
     const string16& search_string) {
   GURL url(GetDefaultSearchURLForSearchTerms(
       ProfileManager::GetDefaultProfileOrOffTheRecord(), search_string));
   if (url.is_valid())
     OpenURL(url);
 }