Changed dumpLayout's name to moveCursorAndDumpContent, as the name
suggested the method was only usable on layouts (while it also works on
text). The method is also no longer marked const, and the previous name
could imply that it had no side effects.
Likewise, renamed restoreLayout to restoreContent.
Change-Id: I46b320e74c07b48e256dc2146f9ecc15af38a8e6