Implement suspend() and resume() for OfflineAudioContext

LayoutTests/webaudio/offlineaudiocontext-suspend-resume-basic-expected.txt

Index: LayoutTests/webaudio/offlineaudiocontext-suspend-resume-basic-expected.txt
diff --git a/LayoutTests/webaudio/offlineaudiocontext-suspend-resume-basic-expected.txt b/LayoutTests/webaudio/offlineaudiocontext-suspend-resume-basic-expected.txt
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+Basic test for OfflineAudioContext.suspend() and OfflineAudioContext.resume().
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS context.suspend() rejected correctly (with TypeError: Failed to execute 'suspend' on 'OfflineAudioContext': 1 argument required, but only 0 present.).
+PASS context.suspend(-1.0) rejected correctly (with InvalidStateError: negative suspend time (-1) is not allowed).
+PASS Scheduling a suspend in the past rejected correctly (with InvalidStateError: cannot schedule a suspend at frame 17536 (0.399229 seconds) because it is earlier than the current frame of 22016).
+PASS Calling multiple suspends at the same rendering quantum rejected correctly (with InvalidStateError: cannot schedule more than one suspend at frame 128 (0.00435374 seconds)).
+PASS Resuming before suspend rejected correctly (with InvalidStateError: cannot resume a context that is not suspended).
+PASS Calling resume on non-suspended context rejected correctly (with InvalidStateError: cannot resume a context that has not started).
+PASS successfullyParsed is true
+
+TEST COMPLETE
+