We have been experimenting with IT technology in schools since the 1990s. There is limited evidence that it improves learning outcomes. As many have pointed out, including Papert and Christensen, if we use the technology to teach the same way as before, do not expect different outcomes. For example, computer-based flash cards are no more effective than paper flash cards.
This story from Official Google for Work Blog about using a new chrome extension in the classroom brought the point home again. The writer talks about how now a teacher can project on every student screen the same page instantaneously. Such a feature makes it easier for a fourth grade teacher to get every child to the desired website faster.
This extension just reinforces the long standing hierarchical style of teaching where the student is given the information to learn. Overlooked was the opportunity for the child to search, learn to search and more importantly share their web page face-to-face with other children.
Note: As long as Google focuses on making teaching easier for the teacher, don't expect any change in learning outcomes. Link for Share to Classroom extension.