fix: windows version (#72)

ui/flutter/windows/runner/win32_window.h

@@ -28,15 +28,16 @@ class Win32Window {
   Win32Window();
   virtual ~Win32Window();
 
-  // Creates and shows a win32 window with |title| and position and size using
+  // Creates a win32 window with |title| that is positioned and sized using
   // |origin| and |size|. New windows are created on the default monitor. Window
   // sizes are specified to the OS in physical pixels, hence to ensure a
-  // consistent size to will treat the width height passed in to this function
-  // as logical pixels and scale to appropriate for the default monitor. Returns
-  // true if the window was created successfully.
-  bool CreateAndShow(const std::wstring& title,
-                     const Point& origin,
-                     const Size& size);
+  // consistent size this function will scale the inputted width and height as
+  // as appropriate for the default monitor. The window is invisible until
+  // |Show| is called. Returns true if the window was created successfully.
+  bool Create(const std::wstring& title, const Point& origin, const Size& size);
+
+  // Show the current window. Returns true if the window was successfully shown.
+  bool Show();
 
   // Release OS resources associated with window.
   void Destroy();
@@ -86,6 +87,9 @@ class Win32Window {
   // Retrieves a class instance pointer for |window|
   static Win32Window* GetThisFromHandle(HWND const window) noexcept;
 
+  // Update the window frame's theme to match the system theme.
+  static void UpdateTheme(HWND const window);
+
   bool quit_on_close_ = false;
 
   // window handle for top level window.