Include tile manager state in lthi state dump

R=vmpstr,enne
BUG=401209

Review URL: https://codereview.chromium.org/463403002

Cr-Commit-Position: refs/heads/master@{#289451}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289451 0039d316-1c4b-4281-b951-d872f2087c98

cc/trees/layer_tree_host_impl.cc

@@ -3217,6 +3217,10 @@ void LayerTreeHostImpl::AsValueWithFrameInto(
     state->BeginArray("tiles");
     tile_manager_->AllTilesAsValueInto(state);
     state->EndArray();
+
+    state->BeginDictionary("tile_manager_basic_state");
+    tile_manager_->BasicStateAsValueInto(state);
+    state->EndDictionary();
   }
   state->BeginDictionary("active_tree");
   active_tree_->AsValueInto(state);