Break large blobs into multiple ipcs during creation.

content/common/webblobregistry_impl.h

Index: content/common/webblobregistry_impl.h
===================================================================
--- content/common/webblobregistry_impl.h	(revision 104763)
+++ content/common/webblobregistry_impl.h	(working copy)
@@ -9,6 +9,10 @@
 #include "ipc/ipc_message.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebBlobRegistry.h"
 
+namespace base {
+class SharedMemory;
+}
+
 namespace WebKit {
 class WebBlobData;
 class WebBlobStorageData;
@@ -29,6 +33,8 @@
   virtual void unregisterBlobURL(const WebKit::WebURL& url);
 
  private:
+  base::SharedMemory* AllocateSharedMemory(size_t buffer_size);
+
   IPC::Message::Sender* sender_;
 };