Make WebURLLoader capable of retaining received buffers.

content/public/child/request_peer.h

Index: content/public/child/request_peer.h
diff --git a/content/public/child/request_peer.h b/content/public/child/request_peer.h
index dfa7a7417ea3d9a6ad36c979fa3b60b1c1e305dd..2322792ef30d16618b3a1afa95526b543095e405 100644
--- a/content/public/child/request_peer.h
+++ b/content/public/child/request_peer.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 
 class GURL;
@@ -33,6 +34,24 @@ struct ResourceResponseInfo;
 // for more information.
 class CONTENT_EXPORT RequestPeer {
  public:
+  // This class represents data gotten from the Browser process. Each data
+  // consists of |payload|, |length| and |encoded_length|. The payload is
+  // valid only when the data instance is valid.
+  // In order to work with Chrome resource loading IPC, it is desirable to
+  // reclaim data in FIFO order in a RequestPeer in terms of performance.
+  // |payload|, |length| and |encoded_length| functions are thread-safe, but
+  // the data object itself must be destroyed on the original thread.
+  class CONTENT_EXPORT ReceivedData {
+   public:
+    virtual ~ReceivedData() {}
+    virtual const char* payload() const = 0;
+    virtual int length() const = 0;
+    // The encoded_length is the length of the encoded data transferred
+    // over the network, which could be different from data length (e.g. for
+    // gzipped content).
+    virtual int encoded_length() const = 0;
+  };
+
   // Called as upload progress is made.
   // note: only for requests with upload progress enabled.
   virtual void OnUploadProgress(uint64 position, uint64 size) = 0;
@@ -59,12 +78,7 @@ class CONTENT_EXPORT RequestPeer {
 
   // Called when a chunk of response data is available. This method may
   // be called multiple times or not at all if an error occurs.
-  // The encoded_data_length is the length of the encoded data transferred
-  // over the network, which could be different from data length (e.g. for
-  // gzipped content).
-  virtual void OnReceivedData(const char* data,
-                              int data_length,
-                              int encoded_data_length) = 0;
+  virtual void OnReceivedData(scoped_ptr<ReceivedData> data) = 0;
 
   // Called when metadata generated by the renderer is retrieved from the
   // cache. This method may be called zero or one times.