Make ResourceHandler::OnWillRead able to complete asynchronously.

content/browser/loader/resource_handler.h

Index: content/browser/loader/resource_handler.h
diff --git a/content/browser/loader/resource_handler.h b/content/browser/loader/resource_handler.h
index cf4a5a065b1b73b3d8ad96cfbf0028e392adf60f..4773b5c9f6e29f2a1f519d6c55536a97a0bc3dfb 100644
--- a/content/browser/loader/resource_handler.h
+++ b/content/browser/loader/resource_handler.h
@@ -110,8 +110,9 @@ class CONTENT_EXPORT ResourceHandler
   // once data is available, OnReadCompleted will be called.
   // TODO(mmenke):  Make this method use a ResourceController, and allow it to
   // succeed asynchronously.
-  virtual bool OnWillRead(scoped_refptr<net::IOBuffer>* buf,
-                          int* buf_size) = 0;
+  virtual void OnWillRead(scoped_refptr<net::IOBuffer>* buf,

[Charlie Harrison, 2017/02/16 21:25:04]

Please update the comment.

[mmenke, 2017/03/08 19:16:07]

Done.

+                          int* buf_size,
+                          std::unique_ptr<ResourceController> controller) = 0;
 
   // Data (*bytes_read bytes) was written into the buffer provided by
   // OnWillRead.  The request will not continue until one of |controller|'s