Implement suspend() and resume() for OfflineAudioContext

Source/modules/webaudio/OfflineAudioContext.idl

Index: Source/modules/webaudio/OfflineAudioContext.idl
diff --git a/Source/modules/webaudio/OfflineAudioContext.idl b/Source/modules/webaudio/OfflineAudioContext.idl
index 4c225d938f979818b2ae117fab4f2cf87b37c8e7..0b12e30387312dfe6678333dd15a06874ac66aae 100644
--- a/Source/modules/webaudio/OfflineAudioContext.idl
+++ b/Source/modules/webaudio/OfflineAudioContext.idl
@@ -31,5 +31,7 @@
 ] interface OfflineAudioContext : AudioContext {
     // Offline rendering
     attribute EventHandler oncomplete;
-    [CallWith=ScriptState,ImplementedAs=startOfflineRendering] Promise<AudioBuffer> startRendering();
+    [CallWith=ScriptState, ImplementedAs=startOfflineRendering, MeasureAs=OfflineAudioContextStartRendering] Promise<AudioBuffer> startRendering();
+    [CallWith=ScriptState, ImplementedAs=suspendContext, MeasureAs=OfflineAudioContextSuspend] Promise<void> suspend(double suspendTime);
+    [CallWith=ScriptState, ImplementedAs=resumeContext, MeasureAs=OfflineAudioContextResume] Promise<void> resume();
 };