Add SetImageData api to chrome.clipboard.

chrome/browser/extensions/clipboard_extension_helper_chromeos.h

+// Copyright 2016 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 CHROME_BROWSER_EXTENSIONS_CLIPBOARD_EXTENSION_HELPER_CHROMEOS_H_
+#define CHROME_BROWSER_EXTENSIONS_CLIPBOARD_EXTENSION_HELPER_CHROMEOS_H_
+
+#include <string>
+#include <vector>
+
+#include "base/callback.h"
+#include "extensions/common/api/clipboard.h"
+
+class SkBitmap;
+
+namespace extensions {
+
+// A helper class for decoding the image data and saving decoded image data on
+// clipboard, called from clipboard extension API.
+class ClipboardExtensionHelper {
+ public:
+  ClipboardExtensionHelper();
+  ~ClipboardExtensionHelper();
+
+  // Decodes and saves the image data on clipboard. Must run on UI thread.
+  void DecodeAndSaveImageData(
+      const std::vector<char>& data,
+      api::clipboard::ImageType type,
+      const base::Closure& success_callback,
+      const base::Callback<void(const std::string&)>& error_callback);
+
+ private:
+  // A class to decode PNG and JPEG file.
+  class ClipboardImageDataDecoder;
+
+  // Handles decoded image data.
+  void OnImageDecoded(const SkBitmap& bitmap);
+  // Handles image decoding failure case.
+  void OnImageDecodeFailure();
+  // Handles image decoding request cancelation case.
+  void OnImageDecodeCancel();
+
+  std::unique_ptr<ClipboardImageDataDecoder> clipboard_image_data_decoder_;
+  base::Closure image_save_success_callback_;
+  base::Callback<void(const std::string&)> image_save_error_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(ClipboardExtensionHelper);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_CLIPBOARD_EXTENSION_HELPER_CHROMEOS_H_