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Blocks workspace upgraders sometimes operate on the workspace in XML
form rather than workspace form. When we did the Blockly update in May
2017, we moved updating the positions of blocks to occur immediately
before the first render of the workspace rather than at workspace load
time. This results in all blocks being at 0, 0 if the project relied
on a component where the upgrader used XML because the blocks do not
get positioned until after the upgrade has run.

This code wraps the blockToDOMWithXY function to update the position
of the block during serialization to XML if rendering is turned off,
i.e. we are loading the workspace.

Fixes #920

Change-Id: Ie19cbe4207e6c36979c2adb767748bb54def4551