cc: Add more traces to the activation path.

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index 47f0e520e44ad521b346ef81905f1ec03a5662d9..57a52206cc96c258cfd7968504854ef3b876edfc 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -538,6 +538,10 @@ void TileManager::DidFinishRunningTasks() {
 }
 
 void TileManager::DidFinishRunningTasksRequiredForActivation() {
+  TRACE_EVENT1("cc",
+               "TileManager::DidFinishRunningTasksRequiredForActivation",
+               "all_tiles_required_for_activation_have_memory",
+               all_tiles_required_for_activation_have_memory_);
   // This is only a true indication that all tiles required for
   // activation are initialized when no tiles are OOM. We need to
   // wait for DidFinishRunningTasks() to be called, try to re-assign