JavaScript dialogs cause a page to lose fullscreen.

chrome/browser/printing/print_job_worker.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/printing/print_job_worker.h"
 
 #include <memory>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 198 matching lines @@
                               printing_context_->settings(),
                               result));
 }
 
 void PrintJobWorker::GetSettingsWithUI(
     int document_page_count,
     bool has_selection,
     bool is_scripted) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
+  PrintingContextDelegate* printing_context_delegate =
+      static_cast<PrintingContextDelegate*>(printing_context_delegate_.get());
+  content::WebContents* web_contents =
+      printing_context_delegate->GetWebContents();
+
 #if defined(OS_ANDROID)
   if (is_scripted) {
-    PrintingContextDelegate* printing_context_delegate =
-        static_cast<PrintingContextDelegate*>(printing_context_delegate_.get());
-    content::WebContents* web_contents =
-        printing_context_delegate->GetWebContents();
     TabAndroid* tab =
         web_contents ? TabAndroid::FromWebContents(web_contents) : nullptr;
 
     // Regardless of whether the following call fails or not, the javascript
     // call will return since startPendingPrint will make it return immediately
     // in case of error.
     if (tab)
       tab->SetPendingPrint();
   }
 #endif
 
+  // Running a dialog causes an exit to webpage-initiated fullscreen.
+  // http://crbug.com/728276
+  if (web_contents->IsFullscreenForCurrentTab())
+    web_contents->ExitFullscreen(true);
+
   // weak_factory_ creates pointers valid only on owner_ thread.
   printing_context_->AskUserForSettings(
       document_page_count, has_selection, is_scripted,
       base::Bind(&PostOnOwnerThread, make_scoped_refptr(owner_),
                  base::Bind(&PrintJobWorker::GetSettingsDone,
                             weak_factory_.GetWeakPtr())));
 }
 
 void PrintJobWorker::UseDefaultSettings() {
   PrintingContext::Result result = printing_context_->UseDefaultSettings();
@@ skipping 187 matching lines @@
                               JobEventDetails::FAILED, 0,
                               base::RetainedRef(document_), nullptr));
   Cancel();
 
   // Makes sure the variables are reinitialized.
   document_ = NULL;
   page_number_ = PageNumber::npos();
 }
 
 }  // namespace printing