Schedule posttask to decide Uma optin option offering

chrome/browser/ui/views/session_crashed_bubble_view.cc

 // Copyright 2014 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/session_crashed_bubble_view.h"
 
 #include <vector>
 
+#include "base/bind.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/sessions/session_restore.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_observer.h"
 #include "chrome/browser/ui/options/options_util.h"
 #include "chrome/browser/ui/startup/session_crashed_bubble.h"
 #include "chrome/browser/ui/startup/startup_browser_creator_impl.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "chrome/browser/ui/views/toolbar/toolbar_view.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/installer/util/google_update_settings.h"
 #include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/web_contents.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "grit/google_chrome_strings.h"
 #include "grit/ui_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/views/controls/button/checkbox.h"
 #include "ui/views/controls/button/label_button.h"
@@ skipping 29 matching lines @@
   // Only show metrics reporting option if user didn't already consent to it.
   if (GoogleUpdateSettings::GetCollectStatsConsent())
     return false;
   return g_browser_process->local_state()->FindPreference(
       prefs::kMetricsReportingEnabled)->IsUserModifiable();
 #else
   return false;
 #endif  // defined(GOOGLE_CHROME_BUILD)
 }
 
+// A helper class that listens to browser removal event.
+class BrowserRemovalObserver : public chrome::BrowserListObserver {
+ public:
+  explicit BrowserRemovalObserver(Browser* browser);
+  ~BrowserRemovalObserver();
+  // Overridden from chrome::BrowserListObserver.
+  virtual void OnBrowserRemoved(Browser* browser) OVERRIDE;

[Alexei Svitkine (slow), 2014/05/20 15:52:42]

Nit: Separate by blank lines.

[yao, 2014/05/20 16:25:44]

Done.

+  bool IsBrowserLive(Browser* browser);
+ private:
+  Browser* browser_;

[Alexei Svitkine (slow), 2014/05/20 15:52:42]

Nit: DISALLOW_COPY_AND_ASSIGN().

[yao, 2014/05/20 16:25:44]

Done.

+};
+
+BrowserRemovalObserver::BrowserRemovalObserver(Browser* browser)
+    : browser_(browser) {
+  BrowserList::AddObserver(this);
+}
+
+BrowserRemovalObserver::~BrowserRemovalObserver() {
+  BrowserList::RemoveObserver(this);
+}
+
+void BrowserRemovalObserver::OnBrowserRemoved(Browser* browser) {
+  if (browser == browser_)
+    browser_ = NULL;
+}
+
+bool BrowserRemovalObserver::IsBrowserLive(Browser* browser) {
+  return browser_ == browser;
+}
+
 }  // namespace
 
 // static
 void SessionCrashedBubbleView::Show(Browser* browser) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   if (browser->profile()->IsOffTheRecord())
     return;
 
+  BrowserRemovalObserver* browser_observer =
+      new BrowserRemovalObserver(browser);
+
+  // Schedule a task to run ShouldOfferMetricsReporting() on FILE thread, since
+  // GoogleUpdateSettings::GetCollectStatsConsent() does IO. Then, call
+  // SessionCrashedBubbleView::ShowForReal with the result.
+  content::BrowserThread::PostTaskAndReplyWithResult(
+      content::BrowserThread::FILE,
+      FROM_HERE,
+      base::Bind(&ShouldOfferMetricsReporting),
+      base::Bind(&SessionCrashedBubbleView::ShowForReal, browser_observer,
+                 browser));
+}
+
+// static
+void SessionCrashedBubbleView::ShowForReal(
+    BrowserRemovalObserver* browser_observer,
+    Browser* browser,

[Alexei Svitkine (slow), 2014/05/20 15:52:42]

I think you can remove this parameter and instead expose a browser() method on
|browser_observer| and do the return if browser_observer->browser() is NULL.

[yao, 2014/05/20 16:25:44]

I was thinking doing a browser==browser_ is safer, but, right, it doesn't make a
difference I guess. 

Done. 

+    bool offer_uma_optin) {
+  if (!browser_observer->IsBrowserLive(browser)) {
+    delete browser_observer;
+    return;
+  }
+  delete browser_observer;
+
   views::View* anchor_view =
       BrowserView::GetBrowserViewForBrowser(browser)->toolbar()->app_menu();
   content::WebContents* web_contents =
       browser->tab_strip_model()->GetActiveWebContents();
   SessionCrashedBubbleView* crash_bubble =
-      new SessionCrashedBubbleView(anchor_view, browser, web_contents);
+      new SessionCrashedBubbleView(anchor_view, browser, web_contents,
+                                   offer_uma_optin);
   views::BubbleDelegateView::CreateBubble(crash_bubble)->Show();
 }
 
 SessionCrashedBubbleView::SessionCrashedBubbleView(
     views::View* anchor_view,
     Browser* browser,
-    content::WebContents* web_contents)
+    content::WebContents* web_contents,
+    bool offer_uma_optin)
     : BubbleDelegateView(anchor_view, views::BubbleBorder::TOP_RIGHT),
       content::WebContentsObserver(web_contents),
       browser_(browser),
       web_contents_(web_contents),
       restore_button_(NULL),
       close_(NULL),
       uma_option_(NULL),
+      offer_uma_optin_(offer_uma_optin),
       started_navigation_(false) {
   set_close_on_deactivate(false);
   registrar_.Add(
       this,
       chrome::NOTIFICATION_TAB_CLOSING,
       content::Source<content::NavigationController>(&(
           web_contents->GetController())));
   browser->tab_strip_model()->AddObserver(this);
 }
 
@@ skipping 77 matching lines @@
 
   layout->StartRow(0, kTextColumnSetId);
   layout->AddView(text_label);
   layout->AddPaddingRow(0, kMarginHeight);
 
   layout->StartRow(0, kButtonColumnSetId);
   layout->AddView(restore_button_);
   layout->AddPaddingRow(0, kMarginHeight);
 
   // Metrics reporting option.
-  if (ShouldOfferMetricsReporting())
+  if (offer_uma_optin_)
     CreateUmaOptinView(layout);
 
   set_color(kWhiteBackgroundColor);
   set_margins(gfx::Insets());
   Layout();
 }
 
 void SessionCrashedBubbleView::CreateUmaOptinView(GridLayout* layout) {
   // Checkbox for metric reporting setting.
   // Since the text to the right of the checkbox can't be a simple string (needs
@@ skipping 129 matching lines @@
 }
 
 void SessionCrashedBubbleView::CloseBubble() {
   GetWidget()->Close();
 }
 
 bool ShowSessionCrashedBubble(Browser* browser) {
   SessionCrashedBubbleView::Show(browser);
   return true;
 }