Implement suspend/resume for AudioContext

LayoutTests/webaudio/audiocontext-suspend-resume-expected.txt

Index: LayoutTests/webaudio/audiocontext-suspend-resume-expected.txt
diff --git a/LayoutTests/webaudio/audiocontext-suspend-resume-expected.txt b/LayoutTests/webaudio/audiocontext-suspend-resume-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e68b68a4f5934b9495d5ac2077c430dfddd34a1f
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+++ b/LayoutTests/webaudio/audiocontext-suspend-resume-expected.txt
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+Test suspend/resume for an (offline) AudioContext
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS context.state is "suspended"
+PASS p1 = context.suspend() did not throw exception.
+PASS [object Object] is an instance of function Promise() { [native code] }
+PASS context.suspend() was correctly rejected for an offline context
+PASS p1 = context.resume() did not throw exception.
+PASS [object Object] is an instance of function Promise() { [native code] }
+PASS context.state is "suspended"
+PASS context.resume() was correctly rejected for an offline context
+PASS context.state is "closed"
+PASS context.suspend() on a closed context rejected as expected
+PASS context.resume() on a closed context rejected as expected
+PASS successfullyParsed is true
+
+TEST COMPLETE
+