Use mojo for Chrome Loading, Part 1

content/browser/loader/async_resource_handler.h

Index: content/browser/loader/async_resource_handler.h
diff --git a/content/browser/loader/async_resource_handler.h b/content/browser/loader/async_resource_handler.h
index 0991021336043dc8b4d990a24352ca6408aaa22d..38b178def3c4e95bc0fd7ff0c202f90ed692c604 100644
--- a/content/browser/loader/async_resource_handler.h
+++ b/content/browser/loader/async_resource_handler.h
@@ -14,6 +14,8 @@
 #include "base/timer/timer.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/browser/loader/resource_message_delegate.h"
+#include "mojo/message_pump/handle_watcher.h"
+#include "mojo/public/cpp/system/data_pipe.h"
 #include "net/base/io_buffer.h"
 #include "url/gurl.h"
 
@@ -34,7 +36,8 @@ class AsyncResourceHandler : public ResourceHandler,
                              public ResourceMessageDelegate {
  public:
   AsyncResourceHandler(net::URLRequest* request,
-                       ResourceDispatcherHostImpl* rdh);
+                       ResourceDispatcherHostImpl* rdh,
+                       bool using_mojo_data_handle);
   ~AsyncResourceHandler() override;
 
   bool OnMessageReceived(const IPC::Message& message) override;
@@ -71,6 +74,7 @@ class AsyncResourceHandler : public ResourceHandler,
   bool CheckForSufficientResource();
   int CalculateEncodedDataLengthToReport();
   void RecordHistogram();
+  void OnWritable(MojoResult result);
 
   scoped_refptr<ResourceBuffer> buffer_;
   ResourceDispatcherHostImpl* rdh_;
@@ -86,6 +90,7 @@ class AsyncResourceHandler : public ResourceHandler,
   bool has_checked_for_sufficient_resources_;
   bool sent_received_response_msg_;
   bool sent_data_buffer_msg_;
+  bool using_mojo_data_handle_;
 
   std::unique_ptr<InliningHelper> inlining_helper_;
   base::TimeTicks response_started_ticks_;
@@ -97,6 +102,9 @@ class AsyncResourceHandler : public ResourceHandler,
 
   int64_t reported_transfer_size_;
 
+  mojo::ScopedDataPipeProducerHandle writer_;
+  mojo::common::HandleWatcher handle_watcher_;
+
   DISALLOW_COPY_AND_ASSIGN(AsyncResourceHandler);
 };