Split "Online" and "Offline" AudioContext processing

Source/platform/audio/ReverbConvolver.cpp

Index: Source/platform/audio/ReverbConvolver.cpp
diff --git a/Source/platform/audio/ReverbConvolver.cpp b/Source/platform/audio/ReverbConvolver.cpp
index 0f05ecc3496238a988172a8de3c60fd194772863..1ab671357b081767dd5582a9175c41db9e4232c7 100644
--- a/Source/platform/audio/ReverbConvolver.cpp
+++ b/Source/platform/audio/ReverbConvolver.cpp
@@ -57,7 +57,7 @@ const size_t RealtimeFrameLimit = 8192  + 4096; // ~278msec @ 44.1KHz
 const size_t MinFFTSize = 128;
 const size_t MaxRealtimeFFTSize = 2048;
 
-ReverbConvolver::ReverbConvolver(AudioChannel* impulseResponse, size_t renderSliceSize, size_t maxFFTSize, size_t convolverRenderPhase, bool useBackgroundThreads)
+ReverbConvolver::ReverbConvolver(AudioChannel* impulseResponse, size_t renderSliceSize, size_t maxFFTSize, size_t convolverRenderPhase, bool hasRealtimeConstraint)
     : m_impulseResponseLength(impulseResponse->length())
     , m_accumulationBuffer(impulseResponse->length() + renderSliceSize)
     , m_inputBuffer(InputBufferSize)
@@ -70,10 +70,6 @@ ReverbConvolver::ReverbConvolver(AudioChannel* impulseResponse, size_t renderSli
     // processing slices.  This way we amortize the cost over more processing slices.
     m_maxRealtimeFFTSize = MaxRealtimeFFTSize;
 
-    // For the moment, a good way to know if we have real-time constraint is to check if we're using background threads.
-    // Otherwise, assume we're being run from a command-line tool.
-    bool hasRealtimeConstraint = useBackgroundThreads;
-
     const float* response = impulseResponse->data();
     size_t totalResponseLength = impulseResponse->length();
 
@@ -100,7 +96,7 @@ ReverbConvolver::ReverbConvolver(AudioChannel* impulseResponse, size_t renderSli
 
         bool isBackgroundStage = false;
 
-        if (useBackgroundThreads && stageOffset > RealtimeFrameLimit) {
+        if (hasRealtimeConstraint && stageOffset > RealtimeFrameLimit) {
             m_backgroundStages.append(stage.release());
             isBackgroundStage = true;
         } else
@@ -122,7 +118,7 @@ ReverbConvolver::ReverbConvolver(AudioChannel* impulseResponse, size_t renderSli
 
     // Start up background thread
     // FIXME: would be better to up the thread priority here.  It doesn't need to be real-time, but higher than the default...
-    if (useBackgroundThreads && m_backgroundStages.size() > 0)
+    if (hasRealtimeConstraint && m_backgroundStages.size() > 0)
         m_backgroundThread = adoptPtr(Platform::current()->createThread("Reverb convolution background thread"));
 }