Implement suspend() and resume() for OfflineAudioContext

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

Index: third_party/WebKit/LayoutTests/webaudio/offlineaudiocontext-suspend-resume-basic-expected.txt
diff --git a/third_party/WebKit/LayoutTests/webaudio/offlineaudiocontext-suspend-resume-basic-expected.txt b/third_party/WebKit/LayoutTests/webaudio/offlineaudiocontext-suspend-resume-basic-expected.txt
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@@ -0,0 +1,19 @@
+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 context.suspend(2.0) rejected correctly (with InvalidStateError: cannot schedule a suspend at frame 88192 (2 seconds) because it is greater than or equal to the total render duration of 44100 frames).
+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 (0.499229 seconds)).
+PASS Scheduling a suspend in the future resolved correctly.
+PASS Scheduling a suspend at frame 128 was successful.
+PASS Scheduling another suspend at the same rendering quantum rejected correctly (with InvalidStateError: cannot schedule more than one suspend at frame 128 (0.00435374 seconds)).
+PASS Scheduling a suspend at 0.5 second.
+PASS Resuming at 0 second (before the actual suspend happens) rejected correctly (with InvalidStateError: cannot resume a context that is running).
+PASS Calling resume on context without any previous suspend rejected correctly (with InvalidStateError: cannot resume a context that has not started).

[Raymond Toy, 2015/10/21 18:22:45]

The description doesn't seem to match the InvalidStateError message.  What is
really supposed to be tested here?

[hongchan, 2015/10/22 18:23:48]

It tries to resume a context that has not started. Throwing InvalidStateError
per the current spec. 

http://webaudio.github.io/web-audio-api/#methods-1

[Raymond Toy, 2015/10/22 18:41:44]

The description is "resume on context without previous suspend".  The error
message is "cannot resume a context that has not been started".  The context has
been started, right?

Perhaps the error message should include the current state. That might make it
clearer why you can't resume.  Basically, you can only resume if the state is
"suspended", right?

[hongchan, 2015/10/22 20:17:04]

No. This is a separate test from others. 
It create a new OfflineAudioContext and resume it right away. So when this check
runs, the context is not started, thus the message is correct.
Printing out the current state is not really helpful either because the context
is initially 'suspended.'

I am changing the description and the comment for this test task, so it makes
sense. A nice catch!

+PASS successfullyParsed is true
+
+TEST COMPLETE
+