Consolidate test support code.

testing/test_support.h

+// Copyright 2015 PDFium 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 TESTING_EMBEDDER_TEST_SUPPORT_H_
+#define TESTING_EMBEDDER_TEST_SUPPORT_H_
+
+#include <stdlib.h>
+#include <string>
+
+#ifdef PDF_ENABLE_V8
+#include "v8/include/libplatform/libplatform.h"
+#include "v8/include/v8.h"
+#endif
+
+// Reads the entire contents of a file into a newly malloc'd buffer.
+char* GetFileContents(const char* filename, size_t* retlen);
+
+#ifdef PDF_ENABLE_V8
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+bool InitializeV8ForPDFium(const std::string& exe_path,
+                           const std::string& bin_dir,
+                           v8::StartupData* natives_blob,
+                           v8::StartupData* snapshot_blob,
+                           v8::Platform** platform);
+#else   // V8_USE_EXTERNAL_STARTUP_DATA
+bool InitializeV8ForPDFium(v8::Platform** platform);
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+#endif  // PDF_ENABLE_V8
+
+class TestLoader {
+ public:
+  TestLoader(const char* pBuf, size_t len);
+  static int GetBlock(void* param,
+                      unsigned long pos,
+                      unsigned char* pBuf,
+                      unsigned long size);
+
+ private:
+  const char* const m_pBuf;
+  const size_t m_Len;
+};
+
+#endif  // TESTING_EMBEDDER_TEST_SUPPORT_H_