Forward MIME types to BrowserPlugin when a viewer is specified.

content/browser/loader/buffered_resource_handler.cc

Index: content/browser/loader/buffered_resource_handler.cc
diff --git a/content/browser/loader/buffered_resource_handler.cc b/content/browser/loader/buffered_resource_handler.cc
index d5cabe35d4b0105f2c7002353dfa14da96d124bc..48061396a7a18634d5cdab08140632a08a091c0c 100644
--- a/content/browser/loader/buffered_resource_handler.cc
+++ b/content/browser/loader/buffered_resource_handler.cc
@@ -15,6 +15,7 @@
 #include "content/browser/loader/certificate_resource_handler.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/loader/resource_request_info_impl.h"
+#include "content/browser/loader/stream_resource_handler.h"
 #include "content/browser/plugin_service_impl.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/download_item.h"
@@ -321,10 +322,22 @@ bool BufferedResourceHandler::SelectNextHandler(bool* defer) {
     if (net::IsSupportedMimeType(mime_type))
       return true;
 
-    scoped_ptr<ResourceHandler> handler(
+    scoped_ptr<StreamResourceHandler> handler(
         host_->MaybeInterceptAsStream(request(), response_.get()));
-    if (handler)
-      return UseAlternateNextHandler(handler.Pass());
+    if (handler) {
+      if (handler->HasPayload()) {
+        handler->SetNextHandler(next_handler_.Pass());
+
+        next_handler_ = handler.Pass();
+        next_handler_->SetController(this);
+
+        int request_id =
+            ResourceRequestInfo::ForRequest(request())->GetRequestID();
+        return CopyReadBufferToNextHandler(request_id);
+      } else {
+        UseAlternateNextHandler(handler.PassAs<ResourceHandler>());
+      }
+    }
 
 #if defined(ENABLE_PLUGINS)
     bool stale;