Add implementation for onFrameDetached and onFrameCancelled

With the detach and cancel events added to the proto, the
onFrameDetached and onFrameCancelled functions need to be implemented
and start emitting the respective events.

Test: Run GAPID, open youtube and play a video.
Bug: 142502670
Change-Id: I25a90e75a83dc4e55a5676697050689dabc56fa1