FirstMeaningfulPaint UMA

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 383 matching lines @@
         }
     }
     if (!m_textPainted && m_paintController->textPainted()) {
         m_textPainted = true;
         m_client->notifyFirstTextPaint();
     }
     if (!m_imagePainted && m_paintController->imagePainted()) {
         m_imagePainted = true;
         m_client->notifyFirstImagePaint();
     }
+    m_client->notifyPaint();

[kouhei (in TOK), 2016/07/28 03:45:04]

Should we refactor this so that we pass notifyPaint(textPainted/imagePainted)
every time, and client manages m_{image,text}Painted flag?

[Kunihiko Sakamoto, 2016/08/01 08:52:07]

Done.

 }
 
 void GraphicsLayer::updateChildList()
 {
     WebLayer* childHost = m_layer->layer();
     childHost->removeAllChildren();
 
     clearContentsLayerIfUnregistered();
 
     if (m_contentsLayer) {
@@ skipping 944 matching lines @@
 {
     if (!layer) {
         fprintf(stderr, "Cannot showGraphicsLayerTree for (nil).\n");
         return;
     }
 
     String output = layer->layerTreeAsText(blink::LayerTreeIncludesDebugInfo);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif