Add a TestBrowserDialog helper class for testing browser dialogs in a consistent way.

ui/base/test/material_design_controller_test_api.cc

Index: ui/base/test/material_design_controller_test_api.cc
diff --git a/ui/base/test/material_design_controller_test_api.cc b/ui/base/test/material_design_controller_test_api.cc
index 029af51adc321a48727605588c4a8a7d1696e39e..c02f674041f8f42392ef887f52d404cd3b11f5dd 100644
--- a/ui/base/test/material_design_controller_test_api.cc
+++ b/ui/base/test/material_design_controller_test_api.cc
@@ -10,15 +10,23 @@ namespace test {
 MaterialDesignControllerTestAPI::MaterialDesignControllerTestAPI(
     MaterialDesignController::Mode mode)
     : previous_mode_(MaterialDesignController::mode_),
-      previous_initialized_(MaterialDesignController::is_mode_initialized_) {
+      previous_initialized_(MaterialDesignController::is_mode_initialized_),
+      previous_include_secondary_ui_(
+          MaterialDesignController::include_secondary_ui_) {
   MaterialDesignController::SetMode(mode);
 }
 
 MaterialDesignControllerTestAPI::~MaterialDesignControllerTestAPI() {
+  MaterialDesignController::include_secondary_ui_ =
+      previous_include_secondary_ui_;
   MaterialDesignController::is_mode_initialized_ = previous_initialized_;
   MaterialDesignController::mode_ = previous_mode_;
 }
 
+void MaterialDesignControllerTestAPI::SetSecondaryUiMaterial(bool value) {
+  MaterialDesignController::include_secondary_ui_ = value;
+}
+
 void MaterialDesignControllerTestAPI::Uninitialize() {
   MaterialDesignController::Uninitialize();
 }