Performance fixes for CoreAnimation.

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 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.
 
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 #include <set>
 #include <utility>
 
@@ skipping 780 matching lines @@
     *backing_store = NULL;
     return true;
   }
 
   // Check for a software backing store of the desired size.
   *backing_store = BackingStoreManager::GetBackingStore(this, desired_size);
   return !!*backing_store;
 }
 
 BackingStore* RenderWidgetHostImpl::GetBackingStore(bool force_create) {
+  TRACE_EVENT1("browser", "RenderWidgetHostImpl::GetBackingStore",
+               "force_create", force_create);
+
   if (!view_)
     return NULL;
 
   // The view_size will be current_size_ for auto-sized views and otherwise the
   // size of the view_. (For auto-sized views, current_size_ is updated during
   // UpdateRect messages.)
   gfx::Size view_size = current_size_;
   if (!should_auto_resize_) {
     // Get the desired size from the current view bounds.
     gfx::Rect view_rect = view_->GetViewBounds();
@@ skipping 1755 matching lines @@
     }
   }
 
   // Add newly generated components into the latency info
   for (lc = new_components.begin(); lc != new_components.end(); ++lc) {
     latency_info->latency_components[lc->first] = lc->second;
   }
 }
 
 }  // namespace content