DevTools: expose layer compositing reasons and paint count via layer tree agent

Source/core/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 97 matching lines @@
     : m_client(client)
     , m_anchorPoint(0.5f, 0.5f, 0)
     , m_opacity(1)
     , m_zPosition(0)
     , m_contentsOpaque(false)
     , m_preserves3D(false)
     , m_backfaceVisibility(true)
     , m_masksToBounds(false)
     , m_drawsContent(false)
     , m_contentsVisible(true)
-    , m_showRepaintCounter(false)
     , m_paintingPhase(GraphicsLayerPaintAllWithOverflowClip)
     , m_contentsOrientation(CompositingCoordinatesTopDown)
     , m_parent(0)
     , m_maskLayer(0)
     , m_replicaLayer(0)
     , m_replicatedLayer(0)
-    , m_repaintCount(0)
+    , m_paintCount(0)
     , m_contentsLayer(0)
     , m_contentsLayerId(0)
     , m_linkHighlight(0)
     , m_contentsLayerPurpose(NoContentsLayer)
     , m_scrollableArea(0)
 {
 #ifndef NDEBUG
     if (m_client)
         m_client->verifyNotPainting();
 #endif
@@ skipping 215 matching lines @@
 
     m_offsetFromRenderer = offset;
 
     // If the compositing layer offset changes, we need to repaint.
     if (shouldSetNeedsDisplay == SetNeedsDisplay)
         setNeedsDisplay();
 }
 
 void GraphicsLayer::paintGraphicsLayerContents(GraphicsContext& context, const IntRect& clip)
 {
-    if (m_client)
-        m_client->paintContents(this, context, m_paintingPhase, clip);
+    if (!m_client)
+        return;
+    incrementPaintCount();
+    m_client->paintContents(this, context, m_paintingPhase, clip);
 }
 
 String GraphicsLayer::animationNameForTransition(AnimatedPropertyID property)
 {
     // | is not a valid identifier character in CSS, so this can never conflict with a keyframe identifier.
     StringBuilder id;
     id.appendLiteral("-|transition");
     id.appendNumber(static_cast<int>(property));
     id.append('-');
     return id.toString();
@@ skipping 512 matching lines @@
     } else if (webLayer == m_layer->layer()) {
         name = m_client->debugName(this);
     } else {
         ASSERT_NOT_REACHED();
     }
     return name;
 }
 
 void GraphicsLayer::setCompositingReasons(WebKit::WebCompositingReasons reasons)
 {
+    m_compositingReasons = reasons;
     m_layer->layer()->setCompositingReasons(reasons);
 }
 
 void GraphicsLayer::setPosition(const FloatPoint& point)
 {
     m_position = point;
     platformLayer()->setPosition(m_position);
 }
 
 void GraphicsLayer::setAnchorPoint(const FloatPoint3D& point)
@@ skipping 423 matching lines @@
 #ifndef NDEBUG
 void showGraphicsLayerTree(const WebCore::GraphicsLayer* layer)
 {
     if (!layer)
         return;
 
     String output = layer->layerTreeAsText(WebCore::LayerTreeIncludesDebugInfo);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif