Allow MojoAsyncResourceHandler::OnWillRead to complete asyncronously

content/browser/loader/mock_resource_loader.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/loader/mock_resource_loader.h"
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
@@ skipping 142 matching lines @@
   return status_;
 }
 
 MockResourceLoader::Status
 MockResourceLoader::OnResponseCompletedFromExternalOutOfBandCancel(
     const net::URLRequestStatus& url_request_status) {
   // This can happen at any point, except from a recursive call from
   // ResourceHandler.
   EXPECT_NE(Status::CALLING_HANDLER, status_);
 
+  waiting_on_buffer_ = false;
   io_buffer_ = nullptr;
   io_buffer_size_ = 0;
   status_ = Status::CALLING_HANDLER;
 
   resource_handler_->OnResponseCompleted(
       url_request_status,
       base::MakeUnique<TestResourceController>(weak_factory_.GetWeakPtr()));
   if (status_ == Status::CALLING_HANDLER)
     status_ = Status::CALLBACK_PENDING;
   EXPECT_NE(Status::CANCELED, status_);
@@ skipping 63 matching lines @@
   // Shouldn't update |io_buffer_| or |io_buffer_size_| on cancel.
   EXPECT_TRUE(status_ == Status::CALLBACK_PENDING ||
               status_ == Status::CALLING_HANDLER);
 
   status_ = Status::IDLE;
   if (canceled_or_idle_run_loop_)
     canceled_or_idle_run_loop_->Quit();
 }
 
 }  // namespace content