Revert 98706 - Initial checkin of the compositor_model_bench tool

Revert 98706 - Initial checkin of the compositor_model_bench tool

This tool simulates the GPU demands of Chromium's GPU-accelerated compositor. In
the current version, we simulate the performance of the existing forward
rendering model; coming changes will prototype a new model.

BUG=None
TEST=self

This is http://codereview.chromium.org/7718020/ with trivial fixes
Original change by Joshua Trask <joshtrask@google.com>;

Review URL: http://codereview.chromium.org/7792002
Patch from Joshua Trask <joshtrask@google.com>;.

TBR=piman@google.com
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=98710