[top-chrome-md] Allows UpdateMaterialDesignColors to be called before MDC::Initialize()

ui/base/material_design/material_design_controller.h

 // Copyright 2015 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 UI_BASE_MATERIAL_DESIGN_MATERIAL_DESIGN_CONTROLLER_H_
 #define UI_BASE_MATERIAL_DESIGN_MATERIAL_DESIGN_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "ui/base/ui_base_export.h"
 
@@ skipping 26 matching lines @@
   // Returns true if the current mode is a material design variant.
   static bool IsModeMaterial();
 
   // Returns true if the current mode is a material design variant and this mode
   // should be extended to cover secondary UI.
   static bool IsSecondaryUiMaterial();
 
   // Returns the per-platform default material design variant.
   static Mode DefaultMode();
 
+  static bool is_mode_initialized() { return is_mode_initialized_; }
+
  private:
   friend class test::MaterialDesignControllerTestAPI;
 
-  // Tracks whether |mode_| has been initialized. This is necessary so tests can
-  // reset the state back to a clean state during tear down.
+  // Tracks whether |mode_| has been initialized. This is necessary to avoid
+  // checking the |mode_| early in initialization before a call to Initialize().
+  // Tests can use it to reset the state back to a clean state during tear down.
   static bool is_mode_initialized_;
 
   // The current Mode to be used by the system.
   static Mode mode_;
 
   // True when |mode_| applies beyond the primary UI (toolbar, tabstrip,
   // etc.). For example, this controls use of MD inside bubbles and dialogs.
   static bool include_secondary_ui_;
 
   // Declarations only. Do not allow construction of an object.
   MaterialDesignController();
   ~MaterialDesignController();
 
   // Resets the initialization state to uninitialized. To be used by tests to
   // allow calling Initialize() more than once.
   static void Uninitialize();
 
   // Set |mode_| to |mode| and updates |is_mode_initialized_| to true. Can be
   // used by tests to directly set the mode.
   static void SetMode(Mode mode);
 
   DISALLOW_COPY_AND_ASSIGN(MaterialDesignController);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_MATERIAL_DESIGN_MATERIAL_DESIGN_CONTROLLER_H_