Make inspector tools active when content is inspectable

This was a regression that occurred when the toolbar was refactored
recently. The correct and previous behavior was if the cursor is in a
location where the context would show an inspector tool, that inspector
tool should be active in the toolbar.

Change-Id: I8ac2b1bd21b843db30e3e9f951702378007e139a
Merge "Make inspector tools active when content is inspectable"