Android: Add chrome-specific dynamic linker.

third_party/crazy_linker/crazy_linker/tests/test_dl_wrappers.cpp

+// Copyright (c) 2013 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.
+
+// A crazy linker test to:
+// - Load a library (libzoo.so) with the linker.
+// - Find the address of the "Zoo" function in libzoo.so.
+// - Call the Zoo() function, which will use dlopen() / dlsym() to
+//   find libbar.so (which depends on libfoo.so).
+// - Close the library.
+
+// This tests the dlopen/dlsym/dlclose wrappers provided by the crazy
+// linker to loaded libraries.
+
+#include <crazy_linker.h>
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef bool (*FunctionPtr)();
+
+static void Panic(const char* fmt, ...) {
+  va_list args;
+  fprintf(stderr, "PANIC: ");
+  va_start(args, fmt);
+  vfprintf(stderr, fmt, args);
+  va_end(args);
+  exit(1);
+}
+
+int main() {
+  crazy_context_t* context = crazy_context_create();
+  crazy_library_t* library;
+
+  // Load libzoo.so
+  if (!crazy_library_open(&library,
+                          "libzoo.so",
+                          context)) {
+    Panic("Could not open library: %s\n", crazy_context_get_error(context));
+  }
+
+  // Find the "Zoo" symbol.
+  FunctionPtr zoo_func;
+  if (!crazy_library_find_symbol(library,
+                                 "Zoo",
+                                 reinterpret_cast<void**>(&zoo_func))) {
+    Panic("Could not find 'Zoo' in libzoo.so\n");
+  }
+
+  // Call it.
+  bool ret = (*zoo_func)();
+  if (!ret)
+    Panic("'Zoo' function failed!");
+
+  // Close the library.
+  printf("Closing libzoo.so\n");
+  crazy_library_close(library);
+
+  crazy_context_destroy(context);
+
+  return 0;
+}