PlzNavigate data pipe

content/browser/loader/navigation_resource_handler.h

Index: content/browser/loader/navigation_resource_handler.h
diff --git a/content/browser/loader/navigation_resource_handler.h b/content/browser/loader/navigation_resource_handler.h
index c605e62c3ebc478180414dd6c4d021cb045eb8cf..af1db87310ca380c717ee7d73d1c71feca46e520 100644
--- a/content/browser/loader/navigation_resource_handler.h
+++ b/content/browser/loader/navigation_resource_handler.h
@@ -9,10 +9,12 @@
 
 #include "base/macros.h"
 #include "content/browser/loader/resource_handler.h"
-#include "content/browser/loader/stream_writer.h"
+#include "mojo/public/cpp/system/data_pipe.h"
+#include "mojo/public/cpp/system/simple_watcher.h"
 
 namespace net {
 class SSLInfo;
+class IOBufferWithSize;
 }
 
 namespace content {
@@ -65,14 +67,42 @@ class NavigationResourceHandler : public ResourceHandler {
   void OnDataDownloaded(int bytes_downloaded) override;
 
  private:
+  class SharedWriter;
+  class WriterIOBuffer;
+
   // Clears |core_| and its reference to the resource handler. After calling
   // this, the lifetime of the request is no longer tied to |core_|.
   void DetachFromCore();
 
+  void InitializeDataPipe(mojo::ScopedDataPipeConsumerHandle* consumer_handle);
+  virtual MojoResult BeginWrite(void** data, uint32_t* available);
+  virtual MojoResult EndWrite(uint32_t written);
+  bool CopyReadDataToDataPipe(bool* defer);
+  bool AllocateWriterIOBuffer(scoped_refptr<net::IOBufferWithSize>* buf,
+                              bool* defer);
+  void OnWritable(MojoResult result);
+
   NavigationURLLoaderImplCore* core_;
-  StreamWriter writer_;
   ResourceDispatcherHostDelegate* resource_dispatcher_host_delegate_;
 
+  bool is_using_io_buffer_not_from_writer_ = false;
+
+  // True if OnWillRead was deferred, in order to wait to be able to allocate a
+  // buffer.
+  bool did_defer_on_will_read_ = false;
+  bool did_defer_on_writing_ = false;
+  bool did_defer_on_redirect_ = false;
+
+  scoped_refptr<net::IOBuffer>* parent_buffer_ = nullptr;
+  int* parent_buffer_size_ = nullptr;
+
+  mojo::SimpleWatcher handle_watcher_;
+  scoped_refptr<net::IOBufferWithSize> buffer_;
+  size_t buffer_offset_ = 0;
+  size_t buffer_bytes_read_ = 0;
+  scoped_refptr<SharedWriter> shared_writer_;
+  bool first_read_ = true;
+
   DISALLOW_COPY_AND_ASSIGN(NavigationResourceHandler);
 };