1 files changed, 69 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/modules/native_io/native_io_file_sync.h b/chromium/third_party/blink/renderer/modules/native_io/native_io_file_sync.h
new file mode 100644
index 00000000000..d36815e6c93
--- /dev/null
+++ b/chromium/third_party/blink/renderer/modules/native_io/native_io_file_sync.h
@@ -0,0 +1,69 @@
+// Copyright 2020 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.
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_NATIVE_IO_NATIVE_IO_FILE_SYNC_H_
+#define THIRD_PARTY_BLINK_RENDERER_MODULES_NATIVE_IO_NATIVE_IO_FILE_SYNC_H_
+
+#include <stdint.h>
+
+#include "base/files/file.h"
+#include "mojo/public/cpp/bindings/remote.h"
+#include "third_party/blink/public/mojom/native_io/native_io.mojom-blink.h"
+#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
+#include "third_party/blink/renderer/core/typed_arrays/array_buffer_view_helpers.h"
+#include "third_party/blink/renderer/core/typed_arrays/dom_array_buffer_view.h"
+#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
+#include "third_party/blink/renderer/platform/heap/handle.h"
+#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
+#include "third_party/blink/renderer/platform/wtf/vector.h"
+
+namespace blink {
+
+class ExceptionState;
+class ExecutionContext;
+
+class NativeIOFileSync final : public ScriptWrappable,
+                               public ExecutionContextLifecycleObserver {
+  DEFINE_WRAPPERTYPEINFO();
+  USING_GARBAGE_COLLECTED_MIXIN(NativeIOFileSync);
+
+ public:
+  NativeIOFileSync(base::File backing_file,
+                   mojo::Remote<mojom::blink::NativeIOFileHost> backend_file,
+                   ExecutionContext*);
+
+  NativeIOFileSync(const NativeIOFileSync&) = delete;
+  NativeIOFileSync& operator=(const NativeIOFileSync&) = delete;
+
+  // Needed because of the mojo::Remote<mojom::blink::NativeIOFile>.
+  ~NativeIOFileSync() override;
+
+  void close();
+  int read(MaybeShared<DOMArrayBufferView> buffer,
+           uint64_t file_offset,
+           ExceptionState&);
+  int write(MaybeShared<DOMArrayBufferView> buffer,
+            uint64_t file_offset,
+            ExceptionState&);
+
+  // GarbageCollected
+  void Trace(Visitor* visitor) override;
+
+  // ExecutionContextLifecycleObserver
+  void ContextDestroyed() override;
+
+ private:
+  // Called when the mojo backend disconnects.
+  void OnBackendDisconnect();
+
+  // The file on disk backing this NativeIOFile.
+  base::File backing_file_;
+
+  // Mojo pipe that holds the renderer's lock on the file.
+  mojo::Remote<mojom::blink::NativeIOFileHost> backend_file_;
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_NATIVE_IO_NATIVE_IO_FILE_SYNC_H_