Introduce WebTaskRunner Patch 1/5

Source/platform/WebTaskRunner.cpp

Index: Source/platform/WebTaskRunner.cpp
diff --git a/Source/platform/exported/WebMemoryAllocatorDump.cpp b/Source/platform/WebTaskRunner.cpp
similarity index 61%
copy from Source/platform/exported/WebMemoryAllocatorDump.cpp
copy to Source/platform/WebTaskRunner.cpp
index b28f540081b18e3a6ea6284cfe0165f15b24576b..a6b0a37edec8cc5cff8af7ac2ba5603184262023 100644
--- a/Source/platform/exported/WebMemoryAllocatorDump.cpp
+++ b/Source/platform/WebTaskRunner.cpp
@@ -3,12 +3,12 @@
 // found in the LICENSE file.
 
 #include "config.h"
-#include "public/platform/WebMemoryAllocatorDump.h"
+#include "public/platform/WebTaskRunner.h"
+
+#include "platform/Task.h"
 
 namespace blink {
 
-WebMemoryAllocatorDump::~WebMemoryAllocatorDump()
-{
-}
+// TODO(alexclarke): Add helpers for posting bound functions as tasks.
 
 } // namespace blink