Flesh out URLLoader's download_to_file function....

chrome/browser/net/blob_url_request_job_factory.cc

Index: chrome/browser/net/blob_url_request_job_factory.cc
===================================================================
--- chrome/browser/net/blob_url_request_job_factory.cc	(revision 60837)
+++ chrome/browser/net/blob_url_request_job_factory.cc	(working copy)
@@ -7,6 +7,8 @@
 #include "chrome/browser/chrome_blob_storage_context.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/net/chrome_url_request_context.h"
+#include "chrome/browser/renderer_host/resource_dispatcher_host.h"
+#include "chrome/browser/renderer_host/resource_dispatcher_host_request_info.h"
 #include "chrome/common/url_constants.h"
 #include "webkit/blob/blob_storage_controller.h"
 #include "webkit/blob/blob_url_request_job.h"
@@ -15,12 +17,20 @@
 
 URLRequestJob* BlobURLRequestJobFactory(URLRequest* request,
                                         const std::string& scheme) {
-  webkit_blob::BlobStorageController* blob_storage_controller =
-      static_cast<ChromeURLRequestContext*>(request->context())->
-          blob_storage_context()->controller();
+  scoped_refptr<webkit_blob::BlobData> data;
+  ResourceDispatcherHostRequestInfo* info =
+      ResourceDispatcherHost::InfoForRequest(request);
+  if (info) {
+    // Resource dispatcher host already looked up the blob data.
+    data = info->requested_blob_data();
+  } else {
+    // This request is not coming thru resource dispatcher host.
+    data  = static_cast<ChromeURLRequestContext*>(request->context())->
+        blob_storage_context()->
+            controller()->GetBlobDataFromUrl(request->url());
+  }
   return new webkit_blob::BlobURLRequestJob(
-      request,
-      blob_storage_controller->GetBlobDataFromUrl(request->url()),
+      request, data,
       ChromeThread::GetMessageLoopProxyForThread(ChromeThread::FILE));
 }