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

components/cloud_devices/cloud_device_description.cc

 // 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.
 
 #include "components/cloud_devices/cloud_device_description.h"
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/values.h"
 #include "components/cloud_devices/cloud_device_description_consts.h"
 
 namespace cloud_devices {
 
 CloudDeviceDescription::CloudDeviceDescription() {
   Reset();
 }
 
 CloudDeviceDescription::~CloudDeviceDescription() {
 }
 
 void CloudDeviceDescription::Reset() {
   root_.reset(new base::DictionaryValue);
   root_->SetString(json::kVersion, json::kVersion10);
 }
 
+bool CloudDeviceDescription::InitFromDictionary(
+    scoped_ptr<base::DictionaryValue> root) {
+  if (!root)
+    return false;
+  Reset();
+  root_ = root.Pass();
+  std::string version;
+  root_->GetString(json::kVersion, &version);
+  return version == json::kVersion10;
+}
+
 bool CloudDeviceDescription::InitFromString(const std::string& json) {
-  Reset();
-
   scoped_ptr<base::Value> parsed(base::JSONReader::Read(json));
   base::DictionaryValue* description = NULL;
   if (!parsed || !parsed->GetAsDictionary(&description))
     return false;
-  root_.reset(description);
   ignore_result(parsed.release());
-
-  std::string version;
-  description->GetString(json::kVersion, &version);
-  return version == json::kVersion10;
+  return InitFromDictionary(make_scoped_ptr(description));
 }
 
 std::string CloudDeviceDescription::ToString() const {
   std::string json;
   base::JSONWriter::WriteWithOptions(root_.get(),
                                      base::JSONWriter::OPTIONS_PRETTY_PRINT,
                                      &json);
   return json;
 }
 
@@ skipping 19 matching lines @@
 }
 
 base::ListValue* CloudDeviceDescription::CreateListItem(
     const std::string& path) {
   base::ListValue* value = new base::ListValue;
   root_->Set(path, value);
   return value;
 }
 
 }  // namespace cloud_devices