Adds PrintingContext implementation stub for Android.

chrome/browser/printing/print_view_manager_base.h

 // Copyright (c) 2013 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_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASE_H_
 #define CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASE_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/prefs/pref_member.h"
 #include "base/strings/string16.h"
@@ skipping 38 matching lines @@
 
   // Helper method for Print*Now().
   bool PrintNowInternal(IPC::Message* message);
 
   // Terminates or cancels the print job if one was pending.
   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
 
   // content::WebContentsObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
+  // IPC Message handlers.
+  virtual void OnPrintingFailed(int cookie);

[whywhat, 2013/08/16 23:31:36]

Maybe we should instead observe NOTIFICATION_PRINT_JOB_RELEASED?

[Lei Zhang, 2013/08/18 09:56:26]

I think other people are trying to kill Notifications altogether, so try not to
add new ones.

+
  private:
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // content::WebContentsObserver implementation.
   virtual void DidStartLoading(
       content::RenderViewHost* render_view_host) OVERRIDE;
 
   // Cancels the print job.
   virtual void StopNavigation() OVERRIDE;
 
   // IPC Message handlers.
   void OnDidGetPrintedPagesCount(int cookie, int number_pages);
   void OnDidGetDocumentCookie(int cookie);
   void OnDidPrintPage(const PrintHostMsg_DidPrintPage_Params& params);
-  void OnPrintingFailed(int cookie);
 
   // Processes a NOTIFY_PRINT_JOB_EVENT notification.
   void OnNotifyPrintJobEvent(const JobEventDetails& event_details);
 
   // Requests the RenderView to render all the missing pages for the print job.
   // No-op if no print job is pending. Returns true if at least one page has
   // been requested to the renderer.
   bool RenderAllMissingPagesNow();
 
   // Quits the current message loop if these conditions hold true: a document is
@@ skipping 68 matching lines @@
 
   // Whether our content is in blocked state.
   bool tab_content_blocked_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintViewManagerBase);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASE_H_