Implement ChromeOS mime type extension mappings.

net/base/platform_mime_util_linux.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 "net/base/platform_mime_util.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "build/build_config.h"
 
 #if defined(OS_ANDROID)
 #include "net/android/network_library.h"
 #else
 #include "base/nix/mime_util_xdg.h"
 #endif
 
 namespace net {
 
 #if defined(OS_ANDROID)
 bool PlatformMimeUtil::GetPlatformMimeTypeFromExtension(
     const base::FilePath::StringType& ext, std::string* result) const {
   return android::GetMimeTypeFromExtension(ext, result);
 }
+#elif defined(OS_CHROMEOS)

[eroman, 2015/05/15 09:05:33]

Actually, I think we need to remove this file from the build when built with
chromeos. Otherwise we will end up with duplicate definitions for
PlatformMimeUtil

[yawano, 2015/05/15 09:19:50]

_linux.cc is included in chromeos build. Changing a gypi file not to include
_linux.cc but to include _chromeos.cc seems to be a big change for me.

How about to do a same thing with OS_ANDROID? i.e. Implement
chromeos::GetMimTypeFromExtension in mime_type_extension_chromeos.cc.

[eroman, 2015/05/18 01:00:08]

Yes that sounds like a good approach (use the same strategy as Android)

[yawano, 2015/05/18 08:59:44]

Done.

+// Implemented in platform_mime_util_chromeos.cc.
 #else
 bool PlatformMimeUtil::GetPlatformMimeTypeFromExtension(
     const base::FilePath::StringType& ext, std::string* result) const {
   // TODO(thestig): This is a temporary hack until we can fix this
   // properly in test shell / webkit.
   // We have to play dumb and not return application/x-perl here
   // to make the reload-subframe-object layout test happy.
   if (ext == "pl")
     return false;
 
@@ skipping 66 matching lines @@
 
 void PlatformMimeUtil::GetPlatformExtensionsForMimeType(
     const std::string& mime_type,
     base::hash_set<base::FilePath::StringType>* extensions) const {
   base::FilePath::StringType ext;
   if (GetPreferredExtensionForMimeType(mime_type, &ext))
     extensions->insert(ext);
 }
 
 }  // namespace net