[android] Make pdfium_unittests work on Android.

testing/utils/path_service.cpp

 // 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.
 
 #include "testing/utils/path_service.h"
 
 #ifdef _WIN32
 #include <Windows.h>
 #elif defined(__APPLE__)
 #include <mach-o/dyld.h>
@@ skipping 55 matching lines @@
 
 // static
 bool PathService::GetSourceDir(std::string* path) {
   if (!GetExecutableDir(path))
     return false;
 
   if (!EndsWithSeparator(*path))
     path->push_back(PATH_SEPARATOR);
   path->append("..");
   path->push_back(PATH_SEPARATOR);
+#if defined(ANDROID)
+  path->append("chromium_tests_root");
+#else   // Non-Android
   path->append("..");
+#endif  // defined(ANDROID)
   return true;
 }
 
 // static
 bool PathService::GetTestDataDir(std::string* path) {
   if (!GetSourceDir(path))
     return false;
 
   if (!EndsWithSeparator(*path))
     path->push_back(PATH_SEPARATOR);
   path->append("testing");
   path->push_back(PATH_SEPARATOR);
   path->append("resources");
   return true;
 }
 
 // static
 bool PathService::GetTestFilePath(const std::string& file_name,
                                   std::string* path) {
   if (!GetTestDataDir(path))
     return false;
 
   if (!EndsWithSeparator(*path))
     path->push_back(PATH_SEPARATOR);
   path->append(file_name);
   return true;
 }