Participant will take capsules of dabrafenib twice a day and tablets of trametinib one time every day. The dabrafenib and trametinib should be taken at the same time in the morning, and the second dose of dabrafenib should be taken about 12 hours later. Participant should take the capsules and tablets with a cup (about 8 ounces) of water every time, either 1 hour before or 2 hours after eating a meal. Participant will stop taking the study drugs 1 day before surgery, and resume taking the study drugs within 1 week after surgery.