Add Foreground-to-FirstMeaningfulPaint histogram

chrome/browser/page_load_metrics/page_load_metrics_util.cc

 // Copyright 2015 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 "chrome/browser/page_load_metrics/page_load_metrics_util.h"
 
 #include <algorithm>
 
 #include "chrome/common/page_load_metrics/page_load_timing.h"
 
@@ skipping 33 matching lines @@
 }  // namespace
 
 bool WasStartedInForegroundOptionalEventInForeground(
     const base::Optional<base::TimeDelta>& event,
     const PageLoadExtraInfo& info) {
   return info.started_in_foreground && event &&
          (!info.first_background_time ||
           event.value() <= info.first_background_time.value());
 }
 
+bool WasStartedInBackgroundOptionalEventInForeground(
+    const base::Optional<base::TimeDelta>& event,
+    const PageLoadExtraInfo& info) {
+  return !info.started_in_foreground && event && info.first_foreground_time &&
+         info.first_foreground_time.value() <= event.value() &&
+         (!info.first_background_time ||
+          event.value() <= info.first_background_time.value());
+}
+
 PageAbortInfo GetPageAbortInfo(const PageLoadExtraInfo& info) {
   if (IsBackgroundAbort(info)) {
     // Though most cases where a tab is backgrounded are user initiated, we
     // can't be certain that we were backgrounded due to a user action. For
     // example, on Android, the screen times out after a period of inactivity,
     // resulting in a non-user-initiated backgrounding.
     return {ABORT_BACKGROUND, UserInitiatedInfo::NotUserInitiated(),
             info.first_background_time.value()};
   }
 
@@ skipping 31 matching lines @@
     const page_load_metrics::PageLoadExtraInfo& info,
     blink::WebLoadingBehaviorFlag behavior) {
   const int all_frame_loading_behavior_flags =
       info.main_frame_metadata.behavior_flags |
       info.subframe_metadata.behavior_flags;
 
   return (all_frame_loading_behavior_flags & behavior) != 0;
 }
 
 }  // namespace page_load_metrics