Use per-frame TaskRunner instead of thread's default in DataConsumerHandle

third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
index ff39381267a7782827829431a53b43ba753b8c95..70cc950632ed496e3892c5832892cd5b9fcdae41 100644
--- a/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
@@ -67,9 +67,10 @@ class EmptyDataHandle final : public WebDataConsumerHandle {
 private:
     class EmptyDataReader final : public WebDataConsumerHandle::Reader {
     public:
-        explicit EmptyDataReader(WebDataConsumerHandle::Client* client) : m_factory(this)
+        explicit EmptyDataReader(WebDataConsumerHandle::Client* client, std::unique_ptr<WebTaskRunner> readerTaskRunner) : m_factory(this)
         {
-            Platform::current()->currentThread()->getWebTaskRunner()->postTask(BLINK_FROM_HERE, WTF::bind(&EmptyDataReader::notify, m_factory.createWeakPtr(), WTF::unretained(client)));
+            DCHECK(readerTaskRunner->runsTasksOnCurrentThread());
+            readerTaskRunner->postTask(BLINK_FROM_HERE, WTF::bind(&EmptyDataReader::notify, m_factory.createWeakPtr(), WTF::unretained(client)));
         }
     private:
         Result beginRead(const void** buffer, WebDataConsumerHandle::Flags, size_t *available) override
@@ -89,9 +90,9 @@ private:
         WeakPtrFactory<EmptyDataReader> m_factory;
     };
 
-    std::unique_ptr<Reader> obtainReader(Client* client) override
+    std::unique_ptr<Reader> obtainReader(Client* client, std::unique_ptr<WebTaskRunner> readerTaskRunner) override
     {
-        return WTF::wrapUnique(new EmptyDataReader(client));
+        return WTF::wrapUnique(new EmptyDataReader(client, std::move(readerTaskRunner)));
     }
     const char* debugName() const override { return "EmptyDataHandle"; }
 };