"Privet" Printing reads DPI for PWG raster conversion from device capabilities.

components/cloud_devices/cloud_device_description.h

 // Copyright 2014 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 COMPONENTS_CLOUD_DEVICES_CLOUD_DEVICE_DESCRIPTION_H_
 #define COMPONENTS_CLOUD_DEVICES_CLOUD_DEVICE_DESCRIPTION_H_
 
 #include <string>
 
 #include "base/callback.h"
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
 
 namespace cloud_devices {
 
 // Provides parsing, serialization and validation Cloud Device Description or
 // Cloud Job Ticket.
 // https://developers.google.com/cloud-print/docs/cdd
 class CloudDeviceDescription {
  public:
   CloudDeviceDescription();
   ~CloudDeviceDescription();
 
   void Reset();
 
+  bool InitFromDictionary(scoped_ptr<base::DictionaryValue> root);
   bool InitFromString(const std::string& json);
 
   std::string ToString() const;
 
   // Returns dictionary with capability/option.
   // Returns NULL if missing.
   const base::DictionaryValue* GetItem(const std::string& path) const;
 
   // Create dictionary for capability/option.
   // Never returns NULL.
   base::DictionaryValue* CreateItem(const std::string& path);
 
   // Returns list with capability/option.
   // Returns NULL if missing.
   const base::ListValue* GetListItem(const std::string& path) const;
 
   // Create list for capability/option.
   // Never returns NULL.
   base::ListValue* CreateListItem(const std::string& path);
 
  private:
   scoped_ptr<base::DictionaryValue> root_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudDeviceDescription);
 };
 
 }  // namespace cloud_devices
 
 #endif  // COMPONENTS_CLOUD_DEVICES_CLOUD_DEVICE_DESCRIPTION_H_