Specify how view designer should implement commit / push / pull behaviors

For now html files in view designer are just "saved". Depending on the commit preferences, it does a save work in progress, or a commit and push.
We could say that for now user has to go back to GWT UI where push merge actions are implemented for doing the push and pull. Yet, when in simple mode, if there is a conflict, save won't be able to happen from view designer.
Two options should be evaluated:

• Implement UI (and required APIs) on Polymer backend.
• Understand and specify how user could be redirected to GWT UI to handle the conflict, if this is something possible, and if it is significantly easier to implement than first option.

This may also be required for application definition ui