Add Startup.BrowserView.FirstPaint / .CompositingEnded histograms.

components/startup_metric_utils/browser/startup_metric_utils.h

 // Copyright 2013 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.
 
 #ifndef COMPONENTS_STARTUP_METRIC_UTILS_BROWSER_STARTUP_METRIC_UTILS_H_
 #define COMPONENTS_STARTUP_METRIC_UTILS_BROWSER_STARTUP_METRIC_UTILS_H_
 
 #include "base/time/time.h"
 
 class PrefRegistrySimple;
@@ skipping 74 matching lines @@
 
 // Call this with the time when the first web contents began navigating its main
 // frame. Adds a suffix to its metrics according to |workload|.
 void RecordFirstWebContentsMainNavigationStart(const base::TimeTicks& ticks,
                                                WebContentsWorkload workload);
 
 // Call this with the time when the first web contents successfully committed
 // its navigation for the main frame.
 void RecordFirstWebContentsMainNavigationFinished(const base::TimeTicks& ticks);
 
+// Call this with the time when the BrowserView painted its children for the
+// first time.
+void RecordBrowserViewFirstPaint(const base::TimeTicks& ticks);
+
+// Call this with the time when the BrowserView painted its children for the
+// first time and we got a CompositingEnded after that.
+void RecordBrowserViewFirstPaintCompositingEnded(const base::TimeTicks& ticks);
+
 // Returns the TimeTicks corresponding to main entry as recorded by
 // RecordMainEntryPointTime. Returns a null TimeTicks if a value has not been
 // recorded yet. This method is expected to be called from the UI thread.
 base::TimeTicks MainEntryPointTicks();
 
 }  // namespace startup_metric_utils
 
 #endif  // COMPONENTS_STARTUP_METRIC_UTILS_BROWSER_STARTUP_METRIC_UTILS_H_