Log message when device lost.

Engine/Graphics/Direct3D9/D3D9Graphics.cpp

@@ -2088,6 +2088,8 @@ void Graphics::ResetDevice()
 
 void Graphics::OnDeviceLost()
 {
+    LOGINFO("Device lost");
+    
     if (impl_->defaultColorSurface_)
     {
         impl_->defaultColorSurface_->Release();

Engine/Graphics/OpenGL/OGLGraphics.cpp

@@ -1770,6 +1770,9 @@ void Graphics::Release(bool clearGPUObjects, bool closeWindow)
     if (!impl_->window_)
         return;
     
+    if (!closeWindow)
+        LOGINFO("OpenGL context lost");
+    
     if (clearGPUObjects)
     {
         // Shutting down: release all GPU objects that still exist