Update CreateDirectory to skip the existence check on Windows.

* This is a temporary workaround to avoid freeze of the host application.
* #1076

PiperOrigin-RevId: 685979550

src/base/file_util.cc

@@ -198,10 +198,18 @@ absl::Status FileUtil::CreateDirectory(const std::string &path) {
 }
 
 absl::Status FileUtilImpl::CreateDirectory(const std::string &path) const {
+#if !defined(_WIN32)
+  // On Windows, this check is skipped to avoid freeze of the host application.
+  // This platform dependent behavior is a temporary solution to avoid
+  // freeze of the host application.
+  // https://github.com/google/mozc/issues/1076
+  //
   // If the path already exists, returns OkStatus and does nothing.
   if (const absl::Status status = DirectoryExists(path); status.ok()) {
     return absl::OkStatus();
   }
+#endif  // !_WIN32
+
 #if defined(_WIN32)
   const std::wstring wide = win32::Utf8ToWide(path);
   if (wide.empty()) {

src/base/file_util.h

@@ -92,7 +92,13 @@ class FileUtil {
   ~FileUtil() = delete;
 
   // Creates a directory. Does not create directories in the way to the path.
-  // If the directory already exists, returns OkStatus and does nothing.
+  // If the directory already exists:
+  // - On Windows: returns an error status.
+  // - Others: returns OkStatus and does nothing.
+  //
+  // The above platform dependent behavior is a temporary solution to avoid
+  // freeze of the host application.
+  // https://github.com/google/mozc/issues/1076
   static absl::Status CreateDirectory(const std::string &path);
 
   // Removes an empty directory.

src/base/file_util_test.cc

@@ -74,8 +74,14 @@ TEST(FileUtilTest, CreateDirectory) {
   EXPECT_OK(FileUtil::CreateDirectory(dirpath));
   EXPECT_OK(FileUtil::DirectoryExists(dirpath));
 
+#if !defined(_WIN32)
+  // On Windows, CreateDirectory does not return OK if the directory already
+  // exists. See the implementation of CreateDirectory in file_util.cc.
+  // https://github.com/google/mozc/issues/1076
+  //
   // Create the same directory again.
   EXPECT_OK(FileUtil::CreateDirectory(dirpath));
+#endif  // !_WIN32
 
   // Delete the directory.
   ASSERT_OK(FileUtil::RemoveDirectory(dirpath));