Fix fdsan Issue in Android Cast Shell

InitSharedInstanceWithPakFileRegion() takes ownership of the passed file
and assigns it to a static instance variable. This means that the next
time base::File(pake_fd) is called on line 250, the file descriptor
already has an owner (and a FdEntry respectively) and
android_fdsan_exchange_owner_tag fails
(in order to prevent a double close. See bionic/libc/bionic/fdsan.cpp
for further information).

Duplicating the file descriptor before calling
InitSharedInstanceWithPakFileRegion should prevent this problem.

Test: Tested on device. Casting a few times back to back does not
trigger the error, while without the fix the error is thrown right away.

Bug: b/142898745
Change-Id: I153ed21eaaa5280d63a296d272cd4f7b46d67859
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003321Reviewed-by: Simeon Anfinrud <sanfin@chromium.org>
Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Commit-Queue: Patrick Rohr <prohr@google.com>
Cr-Commit-Position: refs/heads/master@{#732757}

chromecast/app/cast_main_delegate.cc

@@ -244,10 +244,12 @@ void CastMainDelegate::InitializeResourceBundle() {
   base::MemoryMappedFile::Region pak_region;
   if (pak_fd >= 0) {
     pak_region = global_descriptors->GetRegion(kAndroidPakDescriptor);
-    ui::ResourceBundle::InitSharedInstanceWithPakFileRegion(base::File(pak_fd),
-                                                            pak_region);
+
+    base::File android_pak_file(pak_fd);
+    ui::ResourceBundle::InitSharedInstanceWithPakFileRegion(
+        android_pak_file.Duplicate(), pak_region);
     ui::ResourceBundle::GetSharedInstance().AddDataPackFromFileRegion(
-        base::File(pak_fd), pak_region, ui::SCALE_FACTOR_100P);
+        std::move(android_pak_file), pak_region, ui::SCALE_FACTOR_100P);
     return;
   } else {
     pak_fd = base::android::OpenApkAsset("assets/cast_shell.pak", &pak_region);