Add scale factor tag to data packs

ui/base/resource/data_pack.cc

 // Copyright (c) 2012 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 "ui/base/resource/data_pack.h"
 
 #include <errno.h>
 
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 43 matching lines @@
   HEADER_TRUNCATED,
   WRONG_ENCODING,
 
   LOAD_ERRORS_COUNT,
 };
 
 }  // namespace
 
 namespace ui {
 
-// In .cc for MemoryMappedFile dtor.
-DataPack::DataPack() : resource_count_(0), text_encoding_type_(BINARY) {
+DataPack::DataPack()
+    : resource_count_(0),
+      text_encoding_type_(BINARY),
+      scale_factor_(1.0) {
 }
+
 DataPack::~DataPack() {
 }
 
 bool DataPack::Load(const FilePath& path) {
   mmap_.reset(new file_util::MemoryMappedFile);
   if (!mmap_->Initialize(path)) {
     DLOG(ERROR) << "Failed to mmap datapack";
     UMA_HISTOGRAM_ENUMERATION("DataPack.Load", INIT_FAILED,
                               LOAD_ERRORS_COUNT);
     mmap_.reset();
@@ skipping 99 matching lines @@
     return NULL;
 
   return new base::RefCountedStaticMemory(
       reinterpret_cast<const unsigned char*>(piece.data()), piece.length());
 }
 
 ResourceHandle::TextEncodingType DataPack::GetTextEncodingType() const {
   return text_encoding_type_;
 }
 
+float DataPack::GetScaleFactor() const {
+  return scale_factor_;
+}
+
 // static
 bool DataPack::WritePack(const FilePath& path,
                          const std::map<uint16, base::StringPiece>& resources,
                          TextEncodingType textEncodingType) {
   FILE* file = file_util::OpenFile(path, "wb");
   if (!file)
     return false;
 
   if (fwrite(&kFileFormatVersion, sizeof(kFileFormatVersion), 1, file) != 1) {
     LOG(ERROR) << "Failed to write file version";
@@ skipping 72 matching lines @@
       return false;
     }
   }
 
   file_util::CloseFile(file);
 
   return true;
 }
 
 }  // namespace ui