Record "time to first text paint" UMA metrics in PageLoadHistograms

chrome/renderer/page_load_histograms.cc

 // Copyright (c) 2012 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/renderer/page_load_histograms.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 234 matching lines @@
   Time dom_loading = Time::FromDoubleT(performance.domLoading());
   Time dom_interactive = Time::FromDoubleT(performance.domInteractive());
   Time dom_content_loaded_start =
       Time::FromDoubleT(performance.domContentLoadedEventStart());
   Time dom_content_loaded_end =
       Time::FromDoubleT(performance.domContentLoadedEventEnd());
   Time load_event_start = Time::FromDoubleT(performance.loadEventStart());
   Time load_event_end = Time::FromDoubleT(performance.loadEventEnd());
   Time begin = (request.is_null() ? navigation_start : request_start);
   Time first_paint = document_state->first_paint_time();
+  Time first_non_blank_text =
+      Time::FromDoubleT(performance.firstNonBlankText());
+  Time first_custom_font_text =
+      Time::FromDoubleT(performance.firstCustomFontText());
 
   DCHECK(!navigation_start.is_null());
 
   // It is possible for a document to have navigation_start time, but no
   // request_start. An example is doing a window.open, which synchronously
   // loads "about:blank", then using document.write add a meta http-equiv
   // refresh tag, which causes a navigation. In such case, we will arrive at
   // this function with no request/response timing data and identical load
   // start/end values. Avoid logging this case, as it doesn't add any
   // meaningful information to the histogram.
@@ skipping 325 matching lines @@
       PLT_HISTOGRAM("PLT.PT_BeginToCommit_HTTPS_DataReductionProxy",
                     response_start - begin);
       PLT_HISTOGRAM("PLT.PT_RequestToStart_HTTPS_DataReductionProxy",
                     request_start - navigation_start);
       PLT_HISTOGRAM("PLT.PT_StartToCommit_HTTPS_DataReductionProxy",
                     response_start - request_start);
       PLT_HISTOGRAM("PLT.PT_RequestToCommit_HTTPS_DataReductionProxy",
                     response_start - navigation_start);
     }
   }
+  if (!first_non_blank_text.is_null())
+    PLT_HISTOGRAM("PLT.BeginToFirstNonBlankText", first_non_blank_text - begin);
+  if (!first_custom_font_text.is_null()) {
+    PLT_HISTOGRAM("PLT.BeginToFirstCustomFontText",
+                  first_custom_font_text - begin);
+  }
 }
 
 // These histograms are based on the timing information collected in
 // DocumentState. They should be transitioned to equivalents based on the
 // Navigation Timing records (see DumpPerformanceTiming()) or dropped if not
 // needed. Please do not add new metrics based on DocumentState.
 void DumpDeprecatedHistograms(const WebPerformance& performance,
                               DocumentState* document_state,
                               bool data_reduction_proxy_was_used,
                               bool came_from_websearch,
@@ skipping 410 matching lines @@
 
   DCHECK(document_state);
   DCHECK(ds);
   GURL url(ds->request().url());
   Time start = document_state->start_load_time();
   Time finish = document_state->finish_load_time();
   // TODO(mbelshe): should we log more stats?
   VLOG(1) << "PLT: " << (finish - start).InMilliseconds() << "ms "
           << url.spec();
 }