Forward MIME types to BrowserPlugin when a viewer is specified.

content/browser/loader/resource_dispatcher_host_impl.cc

Index: content/browser/loader/resource_dispatcher_host_impl.cc
diff --git a/content/browser/loader/resource_dispatcher_host_impl.cc b/content/browser/loader/resource_dispatcher_host_impl.cc
index 08bf5773cf678a2afd74e9fd0a26891f3b54e82d..ab59a0395ddc70a0e4d984cc31697b98e34515b0 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.cc
+++ b/content/browser/loader/resource_dispatcher_host_impl.cc
@@ -601,18 +601,22 @@ ResourceDispatcherHostImpl::CreateResourceHandlerForDownload(
 
 scoped_ptr<ResourceHandler>
 ResourceDispatcherHostImpl::MaybeInterceptAsStream(net::URLRequest* request,
-                                                   ResourceResponse* response) {
+                                                   ResourceResponse* response,
+                                                   std::string* payload) {
   ResourceRequestInfoImpl* info = ResourceRequestInfoImpl::ForRequest(request);
   const std::string& mime_type = response->head.mime_type;
 
   GURL origin;
   std::string target_id;
+  std::string view_id;
   if (!delegate_ ||
       !delegate_->ShouldInterceptResourceAsStream(info->GetContext(),
                                                   request->url(),
                                                   mime_type,
                                                   &origin,
-                                                  &target_id)) {
+                                                  &target_id,
+                                                  payload,
+                                                  &view_id)) {
     return scoped_ptr<ResourceHandler>();
   }
 
@@ -630,6 +634,7 @@ ResourceDispatcherHostImpl::MaybeInterceptAsStream(net::URLRequest* request,
       info->GetChildID(),
       info->GetRouteID(),
       target_id,
+      view_id,
       handler->stream()->CreateHandle(
           request->url(),
           mime_type,