[polymer] Merge of master into polymer10-migration

tracing/tracing/metrics/system_health/webview_startup_metric.html

Index: tracing/tracing/metrics/system_health/webview_startup_metric.html
diff --git a/tracing/tracing/metrics/system_health/webview_startup_metric.html b/tracing/tracing/metrics/system_health/webview_startup_metric.html
index b10c9f44638edd7900d472d70a48d1c059c62da6..361ba0dec3179048577adbe9988486cbe07c544c 100644
--- a/tracing/tracing/metrics/system_health/webview_startup_metric.html
+++ b/tracing/tracing/metrics/system_health/webview_startup_metric.html
@@ -15,12 +15,12 @@ found in the LICENSE file.
 
 tr.exportTo('tr.metrics.sh', function() {
   function webviewStartupMetric(values, model) {
-    model.iterateAllEvents(function(slice) {
+    for (var slice of model.getDescendantEvents()) {
       // WebViewStartupInterval is the title of the section of code that is
       // entered (via android.os.Trace.beginSection) when WebView is started
       // up. This value is defined in TelemetryActivity.java.
       if (!(slice instanceof tr.model.Slice))
-        return;
+        continue;
       if (slice.title === 'WebViewStartupInterval') {
         values.addValue(new tr.v.NumericValue(
             'webview_startup_wall_time',
@@ -52,7 +52,7 @@ tr.exportTo('tr.metrics.sh', function() {
                 slice.cpuDuration),
             { description: 'WebView blank URL load CPU time' }));
       }
-    });
+    }
   };
 
   tr.metrics.MetricRegistry.register(webviewStartupMetric);