Fix Windows embedding. Appears that flutter#6523 or flutter#6525 introduced a bug for embedder scenarios causing the window native library to be incorrectly initialized and thus incapable of correctly resolving GL functions. This change fixes that. (flutter#6624)

Author: clarkezone

shell/platform/embedder/embedder.cc

@@ -89,17 +89,17 @@ static bool IsRendererValid(const FlutterRendererConfig* config) {
   return false;
 }
 
-#if OS_LINUX || OS_WIN
-
 static void* DefaultGLProcResolver(const char* name) {
   static fml::RefPtr<fml::NativeLibrary> proc_library =
+#if OS_LINUX
       fml::NativeLibrary::CreateForCurrentProcess();
+#elif OS_WIN  // OS_LINUX
+      fml::NativeLibrary::Create("opengl32.dll");
+#endif        // OS_WIN
   return static_cast<void*>(
       const_cast<uint8_t*>(proc_library->ResolveSymbol(name)));
 }
 
-#endif  // OS_LINUX || OS_WIN
-
 static shell::Shell::CreateCallback<shell::PlatformView>
 InferOpenGLPlatformViewCreationCallback(
     const FlutterRendererConfig* config,