Fix minor typos in comment and param name.

cc/trees/layer_tree_impl.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TREES_LAYER_TREE_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 38 matching lines @@
 class UIResourceRequest;
 class VideoFrameControllerClient;
 struct PendingPageScaleAnimation;
 
 typedef std::vector<UIResourceRequest> UIResourceRequestQueue;
 typedef SyncedProperty<AdditionGroup<float>> SyncedBrowserControls;
 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,
                 scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor,
                 scoped_refptr<SyncedBrowserControls> top_controls_shown_ratio,
                 scoped_refptr<SyncedElasticOverscroll> elastic_overscroll);
   virtual ~LayerTreeImpl();
 
   void Shutdown();
   void ReleaseResources();
@@ skipping 492 matching lines @@
 
   std::unique_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_