Implement window.print() on Android

printing/printing_context_android.h

 // Copyright 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 PRINTING_PRINTING_CONTEXT_ANDROID_H_
 #define PRINTING_PRINTING_CONTEXT_ANDROID_H_
 
 #include <jni.h>
 
 #include <string>
 
 #include "base/android/scoped_java_ref.h"
 #include "printing/printing_context.h"
 
 namespace printing {
 
-// Android subclass of PrintingContext.  The implementation for this header file
-// resides in Chrome for Android repository.  This class communicates with the
+// Android subclass of PrintingContext. This class communicates with the
 // Java side through JNI.
 class PRINTING_EXPORT PrintingContextAndroid : public PrintingContext {
  public:
   explicit PrintingContextAndroid(Delegate* delegate);
   virtual ~PrintingContextAndroid();
 
   // Called when the page is successfully written to a PDF using the file
   // descriptor specified, or when the printing operation failed.
   static void PdfWritingDone(int fd, bool success);
 
   // Called from Java, when printing settings from the user are ready or the
   // printing operation is canceled.
   void AskUserForSettingsReply(JNIEnv* env, jobject obj, jboolean success);
 
   // PrintingContext implementation.
   virtual void AskUserForSettings(

[Vitaly Buka (NO REVIEWS), 2014/11/21 17:05:13]

This is entry point for showing dialog

       int max_pages,
       bool has_selection,
       const PrintSettingsCallback& callback) override;
   virtual Result UseDefaultSettings() override;
   virtual gfx::Size GetPdfPaperSizeDeviceUnits() override;
   virtual Result UpdatePrinterSettings(bool external_preview,
                                        bool show_system_dialog) override;
   virtual Result InitWithSettings(const PrintSettings& settings) override;
   virtual Result NewDocument(const base::string16& document_name) override;
   virtual Result NewPage() override;
@@ skipping 13 matching lines @@
   // ready on the Java side
   PrintSettingsCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintingContextAndroid);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTING_CONTEXT_ANDROID_H_