Break large blobs into multiple ipcs during creation.

webkit/blob/blob_data.h

Index: webkit/blob/blob_data.h
===================================================================
--- webkit/blob/blob_data.h	(revision 102191)
+++ webkit/blob/blob_data.h	(working copy)
@@ -28,8 +28,7 @@
     TYPE_BLOB
   };
 
-  class Item {
-   public:
+  struct Item {
     Item();
     ~Item();
 
@@ -55,6 +54,13 @@
       length_ = length;
     }
 
+    void SetToData(const char* data, uint64 length) {
+      type_ = TYPE_DATA;
+      data_.assign(data, length);
+      offset_ = 0;
+      length_ = length;
+    }
+
     void SetToFile(const FilePath& file_path, uint64 offset, uint64 length,
                    const base::Time& expected_modification_time) {
       type_ = TYPE_FILE;
@@ -71,7 +77,6 @@
       length_ = length;
     }
 
-   private:
     Type type_;
 
     // For Data type.
@@ -91,6 +96,10 @@
   BlobData();
   explicit BlobData(const WebKit::WebBlobData& data);
 
+  void AppendItem(const Item& item) {
+    items_.push_back(item);
+  }
+
   void AppendData(const std::string& data) {
     // TODO(jianli): Consider writing the big data to the disk.
     AppendData(data, 0, static_cast<uint32>(data.size()));
@@ -133,11 +142,6 @@
     content_disposition_ = content_disposition;
   }
 
-  // Should only be called by the IPC ParamTraits for this class.
-  void swap_items(std::vector<Item>* items) {
-    items_.swap(*items);
-  }
-
  private:
   friend class base::RefCounted<BlobData>;