Switch canvas.toBlob from idle-periods implementation to threaded implementation to allow experimen…

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
index e04ea2b304f96f0bc3e3c80e013ff43918bbac47..f6a95122114107a64b01f6fecbe2074405175285 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
@@ -561,11 +561,9 @@ void HTMLCanvasElement::toBlob(FileCallback* callback, const String& mimeType, c
     RefPtr<DOMUint8ClampedArray> imageDataRef(imageData->data());
 
     RefPtr<CanvasAsyncBlobCreator> asyncCreatorRef = CanvasAsyncBlobCreator::create(imageDataRef.release(), encodingMimeType, imageData->size(), callback);
-    if (Platform::current()->isThreadedCompositingEnabled() && (encodingMimeType == DefaultMimeType)) {
-        asyncCreatorRef->scheduleAsyncBlobCreation(true);
-    } else {
-        asyncCreatorRef->scheduleAsyncBlobCreation(false, quality);
-    }
+
+    // TODO(xlai): Remove idle-periods version of implementation completely, http://crbug.com/564218
+    asyncCreatorRef->scheduleAsyncBlobCreation(false, quality);
 }
 
 SecurityOrigin* HTMLCanvasElement::securityOrigin() const