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

pdf/pdfium/pdfium_mem_buffer_file_read.cc

+// 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.
+
+#include "pdf/pdfium/pdfium_mem_buffer_file_read.h"
+
+#include <string.h>
+
+namespace chrome_pdf {
+
+PDFiumMemBufferFileRead::PDFiumMemBufferFileRead(const void* data,
+                                                 size_t size) {
+  m_FileLen = size;
+  m_Param = this;
+  m_GetBlock = &GetBlock;
+  data_ = reinterpret_cast<const unsigned char*>(data);
+}
+
+PDFiumMemBufferFileRead::~PDFiumMemBufferFileRead() {
+}
+
+int PDFiumMemBufferFileRead::GetBlock(void* param,
+                                      unsigned long position,
+                                      unsigned char* buf,
+                                      unsigned long size) {
+  const PDFiumMemBufferFileRead* data =
+      reinterpret_cast<const PDFiumMemBufferFileRead*>(param);
+  if (!data || position + size > data->m_FileLen)
+    return 0;
+  memcpy(buf, data->data_ + position, size);
+  return 1;
+}
+
+}  // namespace chrome_pdf