Fix minor typos in comment and param name.

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index 401a9c5e1f24affe08d67a13bfd495dcf6d7aeaf..750605aa9aecab2a504e92ba27eab4bc94211c08 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -56,7 +56,7 @@ typedef SyncedProperty<AdditionGroup<gfx::Vector2dF>> SyncedElasticOverscroll;
 
 class CC_EXPORT LayerTreeImpl {
  public:
-  // This is the number of times a fixed point has to be hit contiuously by a
+  // This is the number of times a fixed point has to be hit continuously by a
   // layer to consider it as jittering.
   enum : int { kFixedPointHitsThreshold = 3 };
   LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl,