[C++11 Allowed Features] Declares a type-safe null pointer converting from NULL to nullptr [part-…

cc/trees/layer_tree_host_common.h

Index: cc/trees/layer_tree_host_common.h
diff --git a/cc/trees/layer_tree_host_common.h b/cc/trees/layer_tree_host_common.h
index d4c09c69790a7bc429894f07c26cf691207080ee..994c1b4cc95dfc3284d1fd143ed68fb94c44220b 100644
--- a/cc/trees/layer_tree_host_common.h
+++ b/cc/trees/layer_tree_host_common.h
@@ -165,7 +165,7 @@ template <typename LayerType>
 LayerType* LayerTreeHostCommon::FindLayerInSubtree(LayerType* root_layer,
                                                    int layer_id) {
   if (!root_layer)
-    return NULL;
+    return nullptr;
 
   if (root_layer->id() == layer_id)
     return root_layer;
@@ -182,7 +182,7 @@ LayerType* LayerTreeHostCommon::FindLayerInSubtree(LayerType* root_layer,
             get_layer_as_raw_ptr(root_layer->children(), i), layer_id))
       return found;
   }
-  return NULL;
+  return nullptr;
 }
 
 template <typename LayerType>
@@ -219,7 +219,7 @@ LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
           device_transform,
           1.f,
           1.f,
-          NULL,
+          nullptr,
           std::numeric_limits<int>::max() / 2,
           false,
           true,
@@ -243,7 +243,7 @@ LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
           identity_transform_,
           1.f,
           1.f,
-          NULL,
+          nullptr,
           std::numeric_limits<int>::max() / 2,
           false,
           true,