Add infrastructure to run tests on android.

mojo/edk/test/multiprocess_test_helper.h

 // Copyright 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.
 
 #ifndef MOJO_EDK_TEST_MULTIPROCESS_TEST_HELPER_H_
 #define MOJO_EDK_TEST_MULTIPROCESS_TEST_HELPER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/process/process_handle.h"
 #include "base/test/multiprocess_test.h"
 #include "base/test/test_timeouts.h"
 #include "mojo/edk/embedder/scoped_platform_handle.h"
 #include "testing/multiprocess_func_list.h"
 
+// Multi process tests are not supported on android, because the platform
+// doesn't provide an executable to exec and only forking is too hacky and
+// fragile.
+#if defined(OS_ANDROID)
+#error "Multi process tests are not supported."
+#endif
+
 namespace mojo {
 
 namespace embedder {
 class PlatformChannelPair;
 }
 
 namespace test {
 
 class MultiprocessTestHelper {
  public:
@@ skipping 56 matching lines @@
             ::testing::Test::HasNonfatalFailure())         \
                ? 1                                         \
                : 0;                                        \
   }                                                        \
   void test_child_name##TestChildTest()
 
 }  // namespace test
 }  // namespace mojo
 
 #endif  // MOJO_EDK_TEST_MULTIPROCESS_TEST_HELPER_H_