Enable preallocaiton in Comments Mount Content

Summary: There were a lot of mount content which were not preallocation eligible (and that is why likely the QE didn't show improvements in the first place).

Reviewed By: jettbow

Differential Revision: D53040284

fbshipit-source-id: ebf5498f3f00ab2da39a881b5f3f5fde7726de73

litho-core/src/main/java/com/facebook/litho/LayoutState.java

@@ -344,6 +344,10 @@ void preAllocateMountContent(boolean shouldPreallocatePerMountSpec) {
 
         if (mEnableDrawablePreallocation || isMountableView(treeNode.getRenderUnit())) {
 
+          if (isTracing) {
+            ComponentsSystrace.beginSection("preallocateMount: " + component.getSimpleName());
+          }
+
           boolean preallocated =
               MountItemsPool.maybePreallocateContent(
                   mResolveResult.context.getAndroidContext(),
@@ -354,6 +358,10 @@ void preAllocateMountContent(boolean shouldPreallocatePerMountSpec) {
               "Preallocation of "
                   + component.getSimpleName()
                   + (preallocated ? " succeeded" : " failed"));
+
+          if (isTracing) {
+            ComponentsSystrace.endSection();
+          }
         }
       }
     }