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AudioContext.suspend() would call StopRendering().  This stops the audio
thread from pulling the graph (eventually) but it also clears out any
handlers, including those associated with automatic pull nodes for any
AnalyserNode that isn't connected to the destination.  When the context
is resumed, the AnalyserNode isn't pulled anymore, so the output never
changes.

Add a SuspendRendering() method to handle AudioContext.suspend() which
doesn't clear the handlers.  Then when the context is resumed,
AnalyserNodes will get pulled again.  Then StopRendering() is used only
for AudioContext.close() where it is ok to clear out the handlers since
we can't resume a closed context.

Bug: 1018499
Change-Id: I4b4ccf688b37e6b81d310d2596cfff9603048876
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903894Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Commit-Queue: Raymond Toy <rtoy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723609}