Log Message:

Initial landing of Screen, Terminal, and VT100 classes. Some of this code is based on Cory Maccarrone's html terminal, developed internally in Google as part of a different project. Thanks to Cory for allowing us to repurpose it here! This gets us to a point where we have the core classes largely fleshed out. The code passes 45 tests, mostly related to correct handling of vt100 escape sequences. Still to come: network connectivity, keyboard input, and text attributes! BUG=chromium-os:23271 TEST=test_harness.html:45/45 tests passed. Review URL: http://codereview.chromium.org/8680034