Add a host tool to pack R_ARM_RELATIVE relocations in libchrome.<ver>.so.

tools/relocation_packer/src/run_all_unittests.cc

Index: tools/relocation_packer/src/run_all_unittests.cc
diff --git a/ui/native_theme/native_theme_observer.cc b/tools/relocation_packer/src/run_all_unittests.cc
similarity index 53%
copy from ui/native_theme/native_theme_observer.cc
copy to tools/relocation_packer/src/run_all_unittests.cc
index f516a762027fccab32d569f2466d82c65252c104..ec5eb9a3d0d28a12b56aec282aad118cb10e1e51 100644
--- a/ui/native_theme/native_theme_observer.cc
+++ b/tools/relocation_packer/src/run_all_unittests.cc
@@ -2,10 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/native_theme/native_theme_observer.h"
+#include "testing/gtest/include/gtest/gtest.h"
 
-namespace ui {
-
-NativeThemeObserver::~NativeThemeObserver() {}
-
-}  // namespace ui
+int main(int argc, char** argv) {
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}