[android] Make pdfium_unittests work on Android.

testing/utils/path_service.cpp

Index: testing/utils/path_service.cpp
diff --git a/testing/utils/path_service.cpp b/testing/utils/path_service.cpp
index a67a7789531d391b684a18a8db07d7db4cbedc7d..1030c2bb1766de0cc2a356291218ab0c472d8d44 100644
--- a/testing/utils/path_service.cpp
+++ b/testing/utils/path_service.cpp
@@ -73,7 +73,11 @@ bool PathService::GetSourceDir(std::string* 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;
 }