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..9aae4f10fa679381000b7b0f746e9f609eaeb585 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"
@@ -111,7 +112,13 @@ void WebBlobRegistryImpl::removeBlobDataRef(const WebString& uuid) {
 
 void WebBlobRegistryImpl::registerPublicBlobURL(const WebURL& url,
                                                 const WebString& uuid) {
+  // Measure how much jank this synchronous IPC is introducing.
+  base::TimeTicks time_before = base::TimeTicks::Now();
+
   sender_->Send(new BlobHostMsg_RegisterPublicURL(url, uuid.utf8()));
+
+  base::TimeDelta time_delta = base::TimeTicks::Now() - time_before;
+  UMA_HISTOGRAM_TIMES("Storage.Blob.RegisterPublicURLTime", time_delta);
 }
 
 void WebBlobRegistryImpl::revokePublicBlobURL(const WebURL& url) {