HTML MessagePort as mojo::MessagePipeHandle

content/child/blob_storage/webblobregistry_impl.cc

Index: content/child/blob_storage/webblobregistry_impl.cc
diff --git a/content/child/blob_storage/webblobregistry_impl.cc b/content/child/blob_storage/webblobregistry_impl.cc
index a1ef5bec59a67a9dac487332357d30ed32c6d922..5032ed19446c6116fb48c6f6f4f487d922779a9e 100644
--- a/content/child/blob_storage/webblobregistry_impl.cc
+++ b/content/child/blob_storage/webblobregistry_impl.cc
@@ -12,6 +12,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/shared_memory.h"
 #include "base/message_loop/message_loop.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "content/child/blob_storage/blob_consolidation.h"
@@ -111,6 +112,9 @@ void WebBlobRegistryImpl::removeBlobDataRef(const WebString& uuid) {
 
 void WebBlobRegistryImpl::registerPublicBlobURL(const WebURL& url,
                                                 const WebString& uuid) {
+  // Measure how much jank the following synchronous IPC introduces.
+  SCOPED_UMA_HISTOGRAM_TIMER("Storage.Blob.RegisterPublicURLTime");
+
   sender_->Send(new BlobHostMsg_RegisterPublicURL(url, uuid.utf8()));
 }