cc: Report only on active tiles in tracing.

cc/resources/tile.cc

Index: cc/resources/tile.cc
diff --git a/cc/resources/tile.cc b/cc/resources/tile.cc
index 87e1e46eb2b1ce213839a1b6883612111fc11d0e..8fe66a5b5db86358a954187b56e5d78b3617edc2 100644
--- a/cc/resources/tile.cc
+++ b/cc/resources/tile.cc
@@ -62,11 +62,12 @@ void Tile::MarkRequiredForActivation() {
   tile_manager_->DidChangeTilePriority(this);
 }
 
-void Tile::AsValueInto(base::debug::TracedValue* res) const {
+void Tile::AsValueInto(base::debug::TracedValue* res, bool is_active) const {
   TracedValue::MakeDictIntoImplicitSnapshotWithCategory(
       TRACE_DISABLED_BY_DEFAULT("cc.debug"), res, "cc::Tile", this);
   TracedValue::SetIDRef(picture_pile_.get(), res, "picture_pile");
   res->SetDouble("contents_scale", contents_scale_);
+  res->SetBoolean("is_active_tile", is_active);
 
   res->BeginArray("content_rect");
   MathUtil::AddToTracedValue(content_rect_, res);