Have media gallery (through native media file util) use MIME sniffer

webkit/fileapi/media/device_media_async_file_util.cc

Index: webkit/fileapi/media/device_media_async_file_util.cc
diff --git a/webkit/fileapi/media/device_media_async_file_util.cc b/webkit/fileapi/media/device_media_async_file_util.cc
index 6235696ded0ad7a8fa692d1d1da720dfc779978b..a6675c8bbb3564b7e5f7eb01f98108682b96dd5d 100644
--- a/webkit/fileapi/media/device_media_async_file_util.cc
+++ b/webkit/fileapi/media/device_media_async_file_util.cc
@@ -17,6 +17,7 @@
 #include "webkit/fileapi/media/mtp_device_async_delegate.h"
 #include "webkit/fileapi/media/mtp_device_file_system_config.h"
 #include "webkit/fileapi/media/mtp_device_map_service.h"
+#include "webkit/fileapi/media/native_media_file_util.h"
 
 namespace fileapi {
 
@@ -312,9 +313,11 @@ void DeviceMediaAsyncFileUtil::OnDidCreateSnapshotFile(
     const AsyncFileUtil::CreateSnapshotFileCallback& callback,
     const base::PlatformFileInfo& file_info,
     const base::FilePath& platform_path) {
-  if (!callback.is_null())
-    callback.Run(base::PLATFORM_FILE_OK, file_info, platform_path,
-                 kSnapshotFileTemporary);
+  if (!callback.is_null()) {
+    base::PlatformFileError error =
+      NativeMediaFileUtil::IsMediaFile(platform_path);

[vandebo (ex-Chrome), 2013/03/21 16:51:12]

nit: two more spaces.

+    callback.Run(error, file_info, platform_path, kSnapshotFileTemporary);
+  }
 }
 
 void DeviceMediaAsyncFileUtil::OnCreateSnapshotFileError(