Implement suspend() and resume() for OfflineAudioContext

third_party/WebKit/Source/modules/webaudio/AudioContext.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/webaudio/AudioContext.h"
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
@@ skipping 112 matching lines @@
     // Save the resolver which will get resolved when the destination node starts pulling on the
     // graph again.
     {
         AutoLocker locker(this);
         m_resumeResolvers.append(resolver);
     }
 
     return promise;
 }
 
+ScriptPromise AudioContext::suspendContext(ScriptState* scriptState, double suspendTime)
+{
+    // This CANNOT be called on AudioContext; it is to implement the pure
+    // virtual interface from AbstractAudioContext.
+    RELEASE_ASSERT_NOT_REACHED();
+
+    return ScriptPromise::rejectWithDOMException(

[yhirano, 2015/11/06 08:13:29]

RELEASE_ASSERT always takes effect, so L139-L142 does not run. Just returning
ScriptPromise() may be enough.

[hongchan, 2015/11/06 19:33:40]

Since we don't need to define this at all here, I am going to remove this method
as whole.

+        scriptState,
+        DOMException::create(InvalidStateError,
+            "Only offline audio context can be suspended at the specified time."));
+}
+
 ScriptPromise AudioContext::closeContext(ScriptState* scriptState)
 {
     if (isContextClosed()) {
         // We've already closed the context previously, but it hasn't yet been resolved, so just
         // create a new promise and reject it.
         return ScriptPromise::rejectWithDOMException(
             scriptState,
             DOMException::create(InvalidStateError,
                 "Cannot close a context that is being closed or has already been closed."));
     }
@@ skipping 36 matching lines @@
     if (contextState() == Running) {
         destination()->audioDestinationHandler().stopRendering();
         setContextState(Suspended);
         deferredTaskHandler().clearHandlersToBeDeleted();
     }
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)