Add file icons to chrome://downloads/ on the Mac. Add Skia helper CGImageToSkBitmap().

chrome/browser/dom_ui/fileicon_source.cc

 // Copyright (c) 2006-2008 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/dom_ui/fileicon_source.h"
 
 #include "base/gfx/png_encoder.h"
 #include "base/string_util.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/common/time_format.h"
 #include "grit/generated_resources.h"
 #include "net/base/escape.h"
 
 // The path used in internal URLs to file icon data.
 static const char kFileIconPath[] = "fileicon";
 
 FileIconSource::FileIconSource()
     : DataSource(kFileIconPath, MessageLoop::current()) {}
 
 FileIconSource::~FileIconSource() {
   cancelable_consumer_.CancelAllRequests();
 }
 
 void FileIconSource::StartDataRequest(const std::string& path,
                                       int request_id) {
   IconManager* im = g_browser_process->icon_manager();
 
+  std::string escaped_path = UnescapeURLComponent(path, UnescapeRule::SPACES);
+
+#if defined(OS_WIN)
   // The path we receive has the wrong slashes and escaping for what we need;
   // this only appears to matter for getting icons from .exe files.
-  std::string escaped_path = UnescapeURLComponent(path, UnescapeRule::SPACES);
   std::replace(escaped_path.begin(), escaped_path.end(), '/', '\\');
-
-  // Fast look up.
-#if defined(OS_WIN)
   FilePath escaped_filepath(UTF8ToWide(escaped_path));
 #elif defined(OS_POSIX)
   // The correct encoding on Linux may not actually be UTF8.
   FilePath escaped_filepath(escaped_path);
 #endif
   SkBitmap* icon = im->LookupIcon(escaped_filepath, IconLoader::NORMAL);
 
   if (icon) {
     std::vector<unsigned char> png_bytes;
     PNGEncoder::EncodeBGRASkBitmap(*icon, false, &png_bytes);
@@ skipping 21 matching lines @@
     std::vector<unsigned char> png_bytes;
     PNGEncoder::EncodeBGRASkBitmap(*icon, false, &png_bytes);
 
     scoped_refptr<RefCountedBytes> icon_data = new RefCountedBytes(png_bytes);
     SendResponse(request_id, icon_data);
   } else {
     // TODO(glen): send a dummy icon.
     SendResponse(request_id, NULL);
   }
 }