2e646c8729
removeCallbacksAndMessages() is called on the camera thread handler before setting it to null to remove all pending runnables. The purpose is to make sure *OnCameraThread methods are not executed when the camera is stopped, but this does not seem to work reliably. This CL resorts to a belt and braces approach and checks that the the handler is still alive in all *OnCameraThread methods. BUG=b/29015569 R=sakal@webrtc.org Review URL: https://codereview.webrtc.org/2028643002 . Cr-Commit-Position: refs/heads/master@{#12981}