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This CL adds multiple trace events (TRACE_EVENTX) in various points in
the rendering to investigate the cause of glitches.

("webaudio", "AudioDestination::Start")
("webaudio", "AudioDestination::Stop")
("webaudio", "AudioDestination::RequestRenderOnWebThread", "frames_to_render", frames_to_render)
("webaudio", "AudioDestination::Render", "callback_buffer_size", number_of_frames)
("webaudio", "AudioDestinationHandler::Render")

BUG=718554

Review-Url: https://codereview.chromium.org/2858223003
Cr-Commit-Position: refs/heads/master@{#469557}