Implement suspend() and resume() for OfflineAudioContext

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

Index: third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp b/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp
index cba5a99247ab2929a07aae6107dbb4a70cfee023..b1efcf8a2f4df8c5bce622db467e75dad5f97b9c 100644
--- a/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp
@@ -28,6 +28,7 @@
 
 #include "modules/webaudio/AudioNode.h"
 #include "modules/webaudio/AudioNodeOutput.h"
+#include "modules/webaudio/OfflineAudioContext.h"
 #include "platform/ThreadSafeFunctional.h"
 #include "public/platform/Platform.h"
 #include "wtf/MainThread.h"
@@ -60,6 +61,17 @@ void DeferredTaskHandler::unlock()
     m_contextGraphMutex.unlock();
 }
 
+void DeferredTaskHandler::offlineLock()
+{
+    // RELEASE_ASSERT is here to make sure to explicitly crash if this is called
+    // from other than the offline render thread, which is considered as the
+    // audio thread in OfflineAudioContext.
+    RELEASE_ASSERT_WITH_MESSAGE(isAudioThread(),
+        "DeferredTaskHandler::offlineLock() must be called within the offline audio thread.");
+
+    m_contextGraphMutex.lock();
+}
+
 #if ENABLE(ASSERT)
 bool DeferredTaskHandler::isGraphOwner()
 {
@@ -226,12 +238,19 @@ void DeferredTaskHandler::contextWillBeDestroyed()
     // Some handlers might live because of their cross thread tasks.
 }
 
+

[haraken, 2015/11/17 08:28:10]

Nit: Remove the empty line.

[hongchan, 2015/11/17 18:11:44]

Done.

 DeferredTaskHandler::AutoLocker::AutoLocker(AbstractAudioContext* context)
     : m_handler(context->deferredTaskHandler())
 {
     m_handler.lock();
 }
 
+DeferredTaskHandler::OfflineGraphAutoLocker::OfflineGraphAutoLocker(OfflineAudioContext* context)
+    : m_handler(context->deferredTaskHandler())
+{
+    m_handler.offlineLock();
+}
+
 void DeferredTaskHandler::addRenderingOrphanHandler(PassRefPtr<AudioHandler> handler)
 {
     ASSERT(handler);