Refactor Android printing code to make it more testable.

printing/printing_context_android.cc

 // 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.
 
 #include "printing/printing_context_android.h"
 
 #include <vector>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
@@ skipping 73 matching lines @@
     int max_pages,
     bool has_selection,
     const PrintSettingsCallback& callback) {
   // This method is always run in the UI thread.
   callback_ = callback;
 
   JNIEnv* env = base::android::AttachCurrentThread();
   if (j_printing_context_.is_null()) {
     j_printing_context_.Reset(Java_PrintingContext_create(
         env,
-        base::android::GetApplicationContext(),
         reinterpret_cast<int>(this)));
   }
 
   Java_PrintingContext_pageCountEstimationDone(env,
                                                j_printing_context_.obj(),
                                                max_pages);
 }
 
 void PrintingContextAndroid::AskUserForSettingsReply(JNIEnv* env,
                                                      jobject obj,
@@ skipping 133 matching lines @@
   // Intentional No-op.
   return NULL;
 }
 
 // static
 bool PrintingContextAndroid::RegisterPrintingContext(JNIEnv* env) {
    return RegisterNativesImpl(env);
 }
 
 }  // namespace printing