Add the pdf plugin's source in src\pdf.

pdf/number_image_generator.h

+// Copyright (c) 2012 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 PDF_NUMBER_IMAGE_GENERATOR_H
+#define PDF_NUMBER_IMAGE_GENERATOR_H
+
+#include <vector>
+
+#include "ppapi/cpp/image_data.h"
+
+namespace chrome_pdf {
+
+class Instance;
+
+class NumberImageGenerator {
+ public:
+  explicit NumberImageGenerator(Instance* instance);
+  virtual ~NumberImageGenerator();
+
+  void Configure(const pp::ImageData& number_background,
+                 const std::vector<pp::ImageData>& number_images,
+                 float device_scale);
+
+  void GenerateImage(int page_number, pp::ImageData* image);
+
+ private:
+  Instance* instance_;
+  pp::ImageData number_background_;
+  std::vector<pp::ImageData> number_images_;
+  float device_scale_;
+};
+
+}  // namespace chrome_pdf
+
+#endif  // PDF_NUMBER_IMAGE_GENERATOR_H
+