fix long overflow

engine/src/lib/ui/window/window.cc

 
 Window_updateWindowMetricsCallback Window_updateWindowMetrics_;
 
-typedef void (*Window_beginFrameCallback)(long microseconds);
+typedef void (*Window_beginFrameCallback)(int64_t microseconds);
 Window_beginFrameCallback Window_beginFrame_;
 
 typedef void (*Window_drawFrameCallback)();

engine/src/shell/platform/unity/android/uiwidgets_system.h

 #include "Unity/IUnityUIWidgets.h"
 #include "flutter/fml/macros.h"
 #include "runtime/mono_api.h"
+#include <GLES2/gl2.h>
+#include <EGL/egl.h>
 
 namespace uiwidgets {
 
   UIWIDGETS_CALLBACK(void) _WakeUp() { GetInstancePtr()->WakeUp(); }
 
   UIWIDGETS_CALLBACK(void) _GfxWorkerCallback(int eventId, void* data) {
+    auto context = eglGetCurrentContext();
+    auto display = eglGetCurrentDisplay();
+    auto draw = eglGetCurrentSurface(EGL_DRAW);
+    auto read = eglGetCurrentSurface(EGL_READ);
+    eglMakeCurrent(display, draw, read, context);
   }
 
   void Update();