1. Added tests for the new code added by change:I5a796aef
2. WebCore thread now calls the UI thread to set the cursor to
the current position enabling the user to interact with
the content that is being selected on the page.
3. Removed the code that changes the selection on movement of the
cursor ring. We are dropping the "default web view behavior"
as granularity of reading the document since with this change
a user can freely access inputs/buttons/links.
Change-Id: I7a3f6677eff0bc95e8127973d07cec78e3465c7b
9504f5753d