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

chrome/browser/dom_ui/fileicon_source.cc

Index: chrome/browser/dom_ui/fileicon_source.cc
diff --git a/chrome/browser/dom_ui/fileicon_source.cc b/chrome/browser/dom_ui/fileicon_source.cc
index e35d49c3638a5d5b968435c33b5269a226e96a49..daf9a434de624471ccb2dc5e12e68320f7443fc3 100644
--- a/chrome/browser/dom_ui/fileicon_source.cc
+++ b/chrome/browser/dom_ui/fileicon_source.cc
@@ -25,13 +25,12 @@ void FileIconSource::StartDataRequest(const std::string& path,
                                       int request_id) {
   IconManager* im = g_browser_process->icon_manager();
 
-  // 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)
+  // 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::replace(escaped_path.begin(), escaped_path.end(), '/', '\\');
   FilePath escaped_filepath(UTF8ToWide(escaped_path));
 #elif defined(OS_POSIX)
   // The correct encoding on Linux may not actually be UTF8.