Add get rotation for window channel (#79)

Author: xiaowei-guan

flutter/shell/platform/tizen/channels/window_channel.cc

@@ -70,6 +70,8 @@ void WindowChannel::HandleMethodCall(
     map[EncodableValue("width")] = EncodableValue(geometry.width);
     map[EncodableValue("height")] = EncodableValue(geometry.height);
     result->Success(EncodableValue(map));
+  } else if (method_name == "getRotation") {
+    result->Success(EncodableValue(window_->GetRotation()));
   } else {
     result->NotImplemented();
   }

flutter/shell/platform/tizen/tizen_window_ecore_wl2.cc

@@ -225,6 +225,7 @@ void TizenWindowEcoreWl2::RegisterEventHandlers() {
             int32_t degree = rotation_event->angle;
             self->view_delegate_->OnRotate(degree);
             TizenGeometry geometry = self->GetGeometry();
+            ecore_wl2_window_rotation_set(self->ecore_wl2_window_, degree);
             ecore_wl2_window_rotation_change_done_send(
                 self->ecore_wl2_window_, rotation_event->rotation,
                 geometry.width, geometry.height);