Refactor Android printing code to make it more testable.

chrome/browser/android/tab_android.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/android/tab_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "chrome/browser/android/chrome_web_contents_delegate_android.h"
 #include "chrome/browser/android/webapps/single_tab_mode_tab_helper.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/favicon/favicon_tab_helper.h"
 #include "chrome/browser/history/history_tab_helper.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/net/net_error_tab_helper.h"
 #include "chrome/browser/password_manager/password_manager.h"
 #include "chrome/browser/password_manager/password_manager_delegate_impl.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor_factory.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor_tab_helper.h"
 #include "chrome/browser/prerender/prerender_tab_helper.h"
+#include "chrome/browser/printing/print_view_manager_basic.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_android.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/ssl/ssl_tab_helper.h"
 #include "chrome/browser/sync/glue/synced_tab_delegate_android.h"
 #include "chrome/browser/tab_contents/navigation_metrics_recorder.h"
 #include "chrome/browser/translate/translate_tab_helper.h"
 #include "chrome/browser/ui/alternate_error_tab_observer.h"
 #include "chrome/browser/ui/android/content_settings/popup_blocked_infobar_delegate.h"
 #include "chrome/browser/ui/android/infobars/infobar_container_android.h"
@@ skipping 358 matching lines @@
   std::string url;
   if (jurl)
     url = base::android::ConvertJavaStringToUTF8(env, jurl);
 
   content::NavigationEntry* entry =
       web_contents()->GetController().GetVisibleEntry();
   if (entry && url == entry->GetVirtualURL().spec())
     entry->SetTitle(title);
 }
 
+bool TabAndroid::Print(JNIEnv* env, jobject obj) {
+  if (!web_contents())
+    return false;
+
+  printing::PrintViewManagerBasic::CreateForWebContents(web_contents());
+  printing::PrintViewManagerBasic* print_view_manager =
+      printing::PrintViewManagerBasic::FromWebContents(web_contents());
+  if (print_view_manager == NULL)
+    return false;
+
+  print_view_manager->PrintNow();
+  return true;
+}
+
 bool TabAndroid::RegisterTabAndroid(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }