Print preview not showing if default print is invalid.

chrome/renderer/print_web_view_helper.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #define CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #pragma once
 
 #include <utility>
 #include <vector>
@@ skipping 91 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest,
                            BlockScriptInitiatedPrinting);
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, OnPrintPages);
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperPreviewTest, OnPrintPreview);
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperPreviewTest, OnPrintPreviewCancel);
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperPreviewTest, OnPrintPreviewFail);
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperPreviewTest,
                            OnPrintForPrintPreview);
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperPreviewTest,
                            OnPrintForPrintPreviewFail);
+  FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperPreviewTest,
+                           OnPrintPreviewInvalidDefaultPrinter);
+  FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperPreviewTest,
+                           OnPrintForPrintPreviewInvalidPrinter);
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, PrintLayoutTest);
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, PrintWithIframe);
 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
 
   // RenderViewObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message);
   virtual void PrintPage(WebKit::WebFrame* frame);
 
@@ skipping 38 matching lines @@
     FAIL_PRINT,
     FAIL_PREVIEW,
   };
 
   // Notification when printing is done - signal tear-down/free resources.
   void DidFinishPrinting(PrintingResult result);
 
   // Print Settings -----------------------------------------------------------
 
   // Initialize print page settings with default settings.
-  bool InitPrintSettings(WebKit::WebFrame* frame, WebKit::WebNode* node);
+  bool InitPrintSettings(WebKit::WebFrame* frame,
+                         WebKit::WebNode* node,
+                         bool is_preview);
 
   // Initialize print page settings with default settings and prepare the frame
   // for print. A new PrepareFrameAndViewForPrint is created to fulfill the
   // request and is filled into the |prepare| argument.
   bool InitPrintSettingsAndPrepareFrame(
       WebKit::WebFrame* frame,
       WebKit::WebNode* node,
       scoped_ptr<PrepareFrameAndViewForPrint>* prepare);
 
   // Update the current print settings with new |job_settings|. |job_settings|
@@ skipping 215 matching lines @@
 
     State state_;
   };
 
   PrintPreviewContext print_preview_context_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintWebViewHelper);
 };
 
 #endif  // CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_