Implement a JavaScript API for document scanning

chrome/browser/extensions/api/document_scan/document_scan_api.h

Index: chrome/browser/extensions/api/document_scan/document_scan_api.h
diff --git a/chrome/browser/extensions/api/document_scan/document_scan_api.h b/chrome/browser/extensions/api/document_scan/document_scan_api.h
new file mode 100644
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+++ b/chrome/browser/extensions/api/document_scan/document_scan_api.h
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+// Copyright 2014 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.
+
+#include <string>
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/extensions/api/document_scan/document_scan_interface.h"
+#include "chrome/common/extensions/api/document_scan.h"
+#include "extensions/browser/api/async_api_function.h"
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_DOCUMENT_SCAN_DOCUMENT_SCAN_FUNCTION_H_
+#define CHROME_BROWSER_EXTENSIONS_API_DOCUMENT_SCAN_DOCUMENT_SCAN_FUNCTION_H_
+
+namespace extensions {
+
+namespace api {
+
+class DocumentScanScanFunction : public AsyncApiFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("documentScan.scan",
+                             DOCUMENT_SCAN_SCAN)
+  DocumentScanScanFunction();
+
+ protected:
+  ~DocumentScanScanFunction();
+
+  // AsyncApiFunction:
+  virtual bool Prepare() override;
+  virtual void AsyncWorkStart() override;
+  virtual bool Respond() override;
+
+ private:
+  friend class DocumentScanScanFunctionTest;
+
+  void OnScannerListReceived(
+      const std::vector<DocumentScanInterface::ScannerDescription>&
+          scanner_descriptions,
+      const std::string& error);
+  void OnResultsReceived(const std::string& scanned_image,
+                         const std::string& mime_type,
+                         const std::string& error);
+
+  scoped_ptr<document_scan::Scan::Params> params_;
+  scoped_ptr<DocumentScanInterface> document_scan_interface_;
+
+  DISALLOW_COPY_AND_ASSIGN(DocumentScanScanFunction);
+};
+
+}  // namespace api
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_DOCUMENT_SCAN_DOCUMENT_SCAN_FUNCTION_H_