[Invalidation Tracking] Add trace events for compositor based invalidations

Source/core/rendering/compositing/RenderLayerCompositor.cpp

Index: Source/core/rendering/compositing/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/compositing/RenderLayerCompositor.cpp b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
index 7355ed42f989715ca6c3e2965b591e988ef09d2d..b03490f2cc400aedd07534a5d12e2aba1fa29d2a 100644
--- a/Source/core/rendering/compositing/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
@@ -35,6 +35,7 @@
 #include "core/html/HTMLIFrameElement.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorNodeIds.h"
+#include "core/inspector/InspectorTraceEvents.h"
 #include "core/page/Chrome.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/Page.h"
@@ -311,7 +312,7 @@ void RenderLayerCompositor::updateIfNeeded()
 
     RenderLayer* updateRoot = rootRenderLayer();
 
-    Vector<RenderLayer*> layersNeedingPaintInvalidation;
+    LayersNeedingPaintInvalidation layersNeedingPaintInvalidation;
 
     if (updateType >= CompositingUpdateAfterCompositingInputChange) {
         CompositingInputsUpdater(updateRoot).update();
@@ -377,7 +378,12 @@ void RenderLayerCompositor::updateIfNeeded()
     }
 
     for (unsigned i = 0; i < layersNeedingPaintInvalidation.size(); i++) {
-        RenderLayer* layer = layersNeedingPaintInvalidation[i];
+        RenderLayer* layer = layersNeedingPaintInvalidation[i].first;
+        TRACE_EVENT_INSTANT1(
+            TRACE_DISABLED_BY_DEFAULT("devtools.timeline.invalidationTracking"),
+            "LayerInvalidationTracking",
+            "data",
+            InspectorLayerInvalidationTrackingEvent::data(layer->renderer()->containerForPaintInvalidation(), layersNeedingPaintInvalidation[i].second));
         layer->paintInvalidator().computePaintInvalidationRectsIncludingNonCompositingDescendants();
 
         paintInvalidationOnCompositingChange(layer);