[cros] Add user image transparency support.

chrome/browser/chromeos/login/user_manager.cc

 // Copyright (c) 2011 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 "chrome/browser/chromeos/login/user_manager.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 752 matching lines @@
                  username, image, image_path, image_index));
 }
 
 void UserManager::SaveImageToFile(const std::string& username,
                                   const SkBitmap& image,
                                   const FilePath& image_path,
                                   int image_index) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 
   std::vector<unsigned char> encoded_image;
-  if (!gfx::PNGCodec::EncodeBGRASkBitmap(image, true, &encoded_image)) {
+  if (!gfx::PNGCodec::EncodeBGRASkBitmap(image, false, &encoded_image)) {
     LOG(ERROR) << "Failed to PNG encode the image.";
     return;
   }
 
   if (file_util::WriteFile(image_path,
                            reinterpret_cast<char*>(&encoded_image[0]),
                            encoded_image.size()) == -1) {
     LOG(ERROR) << "Failed to save image to file.";
     return;
   }
@@ skipping 163 matching lines @@
 
 User* UserManager::CreateUser(const std::string& email) const {
   User* user = new User(email);
   user->set_oauth_token_status(LoadUserOAuthStatus(email));
   // Used to determine whether user's display name is unique.
   ++display_name_count_[user->GetDisplayName()];
   return user;
 }
 
 }  // namespace chromeos