[Mojo-Loading] Dispatch body data after response is received

content/child/url_response_body_consumer.cc

Index: content/child/url_response_body_consumer.cc
diff --git a/content/child/url_response_body_consumer.cc b/content/child/url_response_body_consumer.cc
index 6874b5053a77b1b5b70d69294da7257ef86790e3..5016ee3a5b6c0646e383d43c26b745bbcdd6c816 100644
--- a/content/child/url_response_body_consumer.cc
+++ b/content/child/url_response_body_consumer.cc
@@ -49,7 +49,13 @@ URLResponseBodyConsumer::URLResponseBodyConsumer(
       resource_dispatcher_(resource_dispatcher),
       handle_(std::move(handle)),
       handle_watcher_(task_runner),
-      has_seen_end_of_data_(!handle_.is_valid()) {
+      has_seen_end_of_data_(!handle_.is_valid()) {}
+
+URLResponseBodyConsumer::~URLResponseBodyConsumer() {}
+
+void URLResponseBodyConsumer::Start(base::SingleThreadTaskRunner* task_runner) {
+  if (has_been_cancelled_)
+    return;
   handle_watcher_.Start(
       handle_.get(), MOJO_HANDLE_SIGNAL_READABLE,
       base::Bind(&URLResponseBodyConsumer::OnReadable, base::Unretained(this)));
@@ -58,8 +64,6 @@ URLResponseBodyConsumer::URLResponseBodyConsumer(
                             MOJO_RESULT_OK));
 }
 
-URLResponseBodyConsumer::~URLResponseBodyConsumer() {}
-
 void URLResponseBodyConsumer::OnComplete(
     const ResourceRequestCompletionStatus& status) {
   if (has_been_cancelled_)