[Invalidation Tracking] Add trace events for compositor based invalidations

Source/core/rendering/compositing/CompositingLayerAssigner.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/rendering/compositing/CompositingLayerAssigner.h"
 
+#include "core/inspector/InspectorTraceEvents.h"
 #include "core/rendering/compositing/CompositedLayerMapping.h"
 #include "platform/TraceEvent.h"
 
 namespace blink {
 
 // We will only allow squashing if the bbox-area:squashed-area doesn't exceed
 // the ratio |gSquashingSparsityTolerance|:1.
 static uint64_t gSquashingSparsityTolerance = 6;
 
 CompositingLayerAssigner::CompositingLayerAssigner(RenderLayerCompositor* compositor)
@@ skipping 148 matching lines @@
         if (!changedSquashingLayer)
             return;
 
         // If we've modified the collection of squashed layers, we must update
         // the graphics layer geometry.
         squashingState.mostRecentMapping->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
 
         layer->clipper().clearClipRectsIncludingDescendants();
 
         // Issue a paint invalidation, since |layer| may have been added to an already-existing squashing layer.
+        TRACE_LAYER_INVALIDATION(layer, InspectorLayerInvalidationTrackingEvent::AddedToSquashingLayer);
         layersNeedingPaintInvalidation.append(layer);
         m_layersChanged = true;
     } else if (compositedLayerUpdate == RemoveFromSquashingLayer) {
         if (layer->groupedMapping()) {
             // Before removing |layer| from an already-existing squashing layer that may have other content, issue a paint invalidation.
             m_compositor->paintInvalidationOnCompositingChange(layer);
             layer->groupedMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
             layer->setGroupedMapping(0);
         }
 
         // If we need to issue paint invalidations, do so now that we've removed it from a squashed layer.
+        TRACE_LAYER_INVALIDATION(layer, InspectorLayerInvalidationTrackingEvent::RemovedFromSquashingLayer);
         layersNeedingPaintInvalidation.append(layer);
         m_layersChanged = true;
 
         layer->setLostGroupedMapping(false);
     }
 }
 
 void CompositingLayerAssigner::assignLayersToBackingsForReflectionLayer(RenderLayer* reflectionLayer, Vector<RenderLayer*>& layersNeedingPaintInvalidation)
 {
     CompositingStateTransitionType compositedLayerUpdate = computeCompositedLayerUpdate(reflectionLayer);
     if (compositedLayerUpdate != NoCompositingStateChange) {
+        TRACE_LAYER_INVALIDATION(reflectionLayer, InspectorLayerInvalidationTrackingEvent::ReflectionLayerChanged);
         layersNeedingPaintInvalidation.append(reflectionLayer);
         m_layersChanged = true;
         m_compositor->allocateOrClearCompositedLayerMapping(reflectionLayer, compositedLayerUpdate);
     }
     m_compositor->updateDirectCompositingReasons(reflectionLayer);
 
     // FIXME: Why do we updateGraphicsLayerConfiguration here instead of in the GraphicsLayerUpdater?
     if (reflectionLayer->hasCompositedLayerMapping())
         reflectionLayer->compositedLayerMapping()->updateGraphicsLayerConfiguration();
 }
 
 void CompositingLayerAssigner::assignLayersToBackingsInternal(RenderLayer* layer, SquashingState& squashingState, Vector<RenderLayer*>& layersNeedingPaintInvalidation)
 {
     if (m_layerSquashingEnabled && requiresSquashing(layer->compositingReasons())) {
         CompositingReasons reasonsPreventingSquashing = getReasonsPreventingSquashing(layer, squashingState);
         if (reasonsPreventingSquashing)
             layer->setCompositingReasons(layer->compositingReasons() | reasonsPreventingSquashing);
     }
 
     CompositingStateTransitionType compositedLayerUpdate = computeCompositedLayerUpdate(layer);
 
     if (m_compositor->allocateOrClearCompositedLayerMapping(layer, compositedLayerUpdate)) {
+        TRACE_LAYER_INVALIDATION(layer, InspectorLayerInvalidationTrackingEvent::NewCompositedLayer);
         layersNeedingPaintInvalidation.append(layer);
         m_layersChanged = true;
     }
 
     // FIXME: special-casing reflection layers here is not right.
     if (layer->reflectionInfo())
         assignLayersToBackingsForReflectionLayer(layer->reflectionInfo()->reflectionLayer(), layersNeedingPaintInvalidation);
 
     // Add this layer to a squashing backing if needed.
     if (m_layerSquashingEnabled) {
@@ skipping 30 matching lines @@
 
     RenderLayerStackingNodeIterator iterator(*layer->stackingNode(), NormalFlowChildren | PositiveZOrderChildren);
     while (RenderLayerStackingNode* curNode = iterator.next())
         assignLayersToBackingsInternal(curNode->layer(), squashingState, layersNeedingPaintInvalidation);
 
     if (squashingState.hasMostRecentMapping && &squashingState.mostRecentMapping->owningLayer() == layer)
         squashingState.haveAssignedBackingsToEntireSquashingLayerSubtree = true;
 }
 
 }