cc: Add some missing braces for style correctness.

cc/trees/layer_tree_host.cc

 // Copyright 2011 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.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include <algorithm>
 #include <stack>
 #include <string>
 
@@ skipping 270 matching lines @@
 
   LayerTreeImpl* sync_tree = host_impl->sync_tree();
 
   if (next_commit_forces_redraw_) {
     sync_tree->ForceRedrawNextActivation();
     next_commit_forces_redraw_ = false;
   }
 
   sync_tree->set_source_frame_number(source_frame_number());
 
-  if (needs_full_tree_sync_)
+  if (needs_full_tree_sync_) {
     sync_tree->SetRootLayer(TreeSynchronizer::SynchronizeTrees(
         root_layer(), sync_tree->DetachLayerTree(), sync_tree));
+  }
+
   {
     TRACE_EVENT0("cc", "LayerTreeHost::PushProperties");
     TreeSynchronizer::PushProperties(root_layer(), sync_tree->root_layer());
   }
 
   sync_tree->set_needs_full_tree_sync(needs_full_tree_sync_);
   needs_full_tree_sync_ = false;
 
   if (hud_layer_.get()) {
     LayerImpl* hud_impl = LayerTreeHostCommon::FindLayerInSubtree(
@@ skipping 968 matching lines @@
   swap_promise_list_.push_back(swap_promise.Pass());
 }
 
 void LayerTreeHost::BreakSwapPromises(SwapPromise::DidNotSwapReason reason) {
   for (size_t i = 0; i < swap_promise_list_.size(); i++)
     swap_promise_list_[i]->DidNotSwap(reason);
   swap_promise_list_.clear();
 }
 
 }  // namespace cc