ServiceWorker: Add UMA to measure execution times of onpush

content/renderer/service_worker/service_worker_script_context.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/service_worker/service_worker_script_context.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "content/child/thread_safe_sender.h"
@@ skipping 113 matching lines @@
       "ServiceWorker.FetchEventExecutionTime",
       base::TimeTicks::Now() - fetch_start_timings_[request_id]);
   fetch_start_timings_.erase(request_id);
 
   Send(new ServiceWorkerHostMsg_FetchEventFinished(
       GetRoutingID(), request_id, result, response));
 }
 
 void ServiceWorkerScriptContext::DidHandlePushEvent(
     int request_id,
-    blink::WebServiceWorkerEventResult unused) {
+    blink::WebServiceWorkerEventResult result) {
   // TODO(johnme): Plumb through the result.
+  if (result == blink::WebServiceWorkerEventResultCompleted) {
+    UMA_HISTOGRAM_TIMES(
+        "ServiceWorker.PushEventExecutionTime",
+        base::TimeTicks::Now() - push_start_timings_[request_id]);
+  }
+  push_start_timings_.erase(request_id);
+
   Send(new ServiceWorkerHostMsg_PushEventFinished(
       GetRoutingID(), request_id));
 }
 
 void ServiceWorkerScriptContext::DidHandleSyncEvent(int request_id) {
   Send(new ServiceWorkerHostMsg_SyncEventFinished(
       GetRoutingID(), request_id));
 }
 
 void ServiceWorkerScriptContext::GetClientDocuments(
@@ skipping 76 matching lines @@
 void ServiceWorkerScriptContext::OnSyncEvent(int request_id) {
   TRACE_EVENT0("ServiceWorker",
                "ServiceWorkerScriptContext::OnSyncEvent");
   proxy_->dispatchSyncEvent(request_id);
 }
 
 void ServiceWorkerScriptContext::OnPushEvent(int request_id,
                                              const std::string& data) {
   TRACE_EVENT0("ServiceWorker",
                "ServiceWorkerScriptContext::OnPushEvent");
+  push_start_timings_[request_id] = base::TimeTicks::Now();
   proxy_->dispatchPushEvent(request_id, blink::WebString::fromUTF8(data));
 }
 
 void ServiceWorkerScriptContext::OnGeofencingEvent(
     int request_id,
     blink::WebGeofencingEventType event_type,
     const std::string& region_id,
     const blink::WebCircularGeofencingRegion& region) {
   TRACE_EVENT0("ServiceWorker",
                "ServiceWorkerScriptContext::OnGeofencingEvent");
@@ skipping 39 matching lines @@
     return;
   }
   scoped_ptr<blink::WebServiceWorkerClientsInfo> info(
       new blink::WebServiceWorkerClientsInfo);
   info->clientIDs = client_ids;
   callbacks->onSuccess(info.release());
   pending_clients_callbacks_.Remove(request_id);
 }
 
 }  // namespace content