[Invalidation Tracking] Add trace events for compositor based invalidations

Source/core/rendering/compositing/GraphicsLayerUpdater.cpp

Index: Source/core/rendering/compositing/GraphicsLayerUpdater.cpp
diff --git a/Source/core/rendering/compositing/GraphicsLayerUpdater.cpp b/Source/core/rendering/compositing/GraphicsLayerUpdater.cpp
index 1b1608f664eb69c733890e0053f5c77d68bfeac5..a4cdd91a174f309ca7ed74d2a40f746e05d1c39e 100644
--- a/Source/core/rendering/compositing/GraphicsLayerUpdater.cpp
+++ b/Source/core/rendering/compositing/GraphicsLayerUpdater.cpp
@@ -28,6 +28,7 @@
 #include "core/rendering/compositing/GraphicsLayerUpdater.h"
 
 #include "core/html/HTMLMediaElement.h"
+#include "core/inspector/InspectorTraceEvents.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderLayerReflectionInfo.h"
 #include "core/rendering/RenderPart.h"
@@ -81,14 +82,14 @@ GraphicsLayerUpdater::~GraphicsLayerUpdater()
 {
 }
 
-void GraphicsLayerUpdater::update(RenderLayer& layer, Vector<RenderLayer*>& layersNeedingPaintInvalidation)
+void GraphicsLayerUpdater::update(RenderLayer& layer, LayersNeedingPaintInvalidation& layersNeedingPaintInvalidation)
 {
     TRACE_EVENT0("blink", "GraphicsLayerUpdater::update");
     updateRecursive(layer, DoNotForceUpdate, UpdateContext(), layersNeedingPaintInvalidation);
     layer.compositor()->updateRootLayerPosition();
 }
 
-void GraphicsLayerUpdater::updateRecursive(RenderLayer& layer, UpdateType updateType, const UpdateContext& context, Vector<RenderLayer*>& layersNeedingPaintInvalidation)
+void GraphicsLayerUpdater::updateRecursive(RenderLayer& layer, UpdateType updateType, const UpdateContext& context, LayersNeedingPaintInvalidation& layersNeedingPaintInvalidation)
 {
     if (layer.hasCompositedLayerMapping()) {
         CompositedLayerMapping* mapping = layer.compositedLayerMapping();
@@ -98,7 +99,7 @@ void GraphicsLayerUpdater::updateRecursive(RenderLayer& layer, UpdateType update
             ASSERT(compositingContainer == layer.enclosingLayerWithCompositedLayerMapping(ExcludeSelf));
 
             if (mapping->updateRequiresOwnBackingStoreForAncestorReasons(compositingContainer)) {
-                layersNeedingPaintInvalidation.append(&layer);
+                layersNeedingPaintInvalidation.append(std::make_pair(&layer, InspectorLayerInvalidationTrackingEvent::AncestorRequiresNewLayer));
                 updateType = ForceUpdate;
             }