Makes MaterialDesignController initialization explicit

ui/shell_dialogs/run_all_unittests.cc

Index: ui/shell_dialogs/run_all_unittests.cc
diff --git a/ui/shell_dialogs/run_all_unittests.cc b/ui/shell_dialogs/run_all_unittests.cc
index 08996518bc9492d046e7fa18e783a9d352402bec..1f5b39d808276965dede2f02449d0bd69d8e6543 100644
--- a/ui/shell_dialogs/run_all_unittests.cc
+++ b/ui/shell_dialogs/run_all_unittests.cc
@@ -13,6 +13,7 @@
 #include "base/mac/bundle_locations.h"
 #include "base/path_service.h"
 #include "base/test/mock_chrome_application_mac.h"
+#include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/resource/resource_bundle.h"
 #endif
 
@@ -49,6 +50,7 @@ void ShellDialogsTestSuite::Initialize() {
   base::mac::SetOverrideFrameworkBundlePath(path);
 
   // Setup resource bundle.
+  ui::MaterialDesignController::Initialize();
   ui::ResourceBundle::InitSharedInstanceWithLocale(
       "en-US", nullptr, ui::ResourceBundle::LOAD_COMMON_RESOURCES);
 #endif