Revert of Revert "Post loading tasks on the appropriate WebFrameScheduler's queue."

content/child/request_info.h

Index: content/child/request_info.h
diff --git a/content/child/request_info.h b/content/child/request_info.h
index e610ac8917554029957dc123b36c938033908f7b..037c1db059a588968cec13d67e16985a62b38948 100644
--- a/content/child/request_info.h
+++ b/content/child/request_info.h
@@ -17,8 +17,13 @@
 #include "content/public/common/resource_type.h"
 #include "net/base/request_priority.h"
 #include "third_party/WebKit/public/platform/WebReferrerPolicy.h"
+#include "third_party/WebKit/public/platform/WebTaskRunner.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "url/gurl.h"
+
+namespace blink {
+class WebTaskRunner;
+} // namespace blink
 
 namespace content {
 
@@ -110,6 +115,9 @@
   // Extra data associated with this request.  We do not own this pointer.
   blink::WebURLRequest::ExtraData* extra_data;
 
+  // Optional, the specific task queue to execute loading tasks on.
+  scoped_ptr<blink::WebTaskRunner> loading_web_task_runner;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(RequestInfo);
 };