Update the nine patch layer to use UI resources

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 "base/bind.h"
@@ skipping 1137 matching lines @@
   if (iter == ui_resource_client_map_.end())
     return;
 
   UIResourceRequest request;
   request.type = UIResourceRequest::UIResourceDelete;
   request.id = uid;
   ui_resource_request_queue_.push_back(request);
   ui_resource_client_map_.erase(uid);
 }
 
+// Deletes a UI resource.  May safely be called more than once.

[danakj, 2013/08/27 15:42:48]

Remove this?

[powei, 2013/08/27 22:39:28]

Done.

+gfx::Size LayerTreeHost::GetUIResourceSize(UIResourceId uid) {
+  UIResourceClientMap::iterator iter = ui_resource_client_map_.find(uid);

[danakj, 2013/08/27 15:42:48]

nit: s/iter/it/

[powei, 2013/08/27 22:39:28]

Done.

+  if (iter == ui_resource_client_map_.end())
+    return gfx::Size();
+
+  DCHECK(iter->second);
+
+  bool resource_lost = false;
+  scoped_refptr<UIResourceBitmap> bitmap =
+      iter->second->GetBitmap(uid, resource_lost);

[danakj, 2013/08/27 15:42:48]

can you use a local variable const& or non-const& of the it->second value so we
can see it's type explicitly here?

[powei, 2013/08/27 22:39:28]

Done.

+
+  DCHECK(bitmap.get());
+
+  return bitmap->GetSize();
+}
+
 void LayerTreeHost::UIResourceLost(UIResourceId uid) {
   UIResourceClientMap::iterator iter = ui_resource_client_map_.find(uid);
   if (iter == ui_resource_client_map_.end())
     return;
 
   UIResourceRequest request;
   bool resource_lost = true;
   request.type = UIResourceRequest::UIResourceCreate;
   request.id = uid;
   request.bitmap = iter->second->GetBitmap(uid, resource_lost);
   DCHECK(request.bitmap.get());
   ui_resource_request_queue_.push_back(request);
 }
 
 void LayerTreeHost::DidLoseUIResources() {
   // When output surface is lost, we need to recreate the resource.
   for (UIResourceClientMap::iterator iter = ui_resource_client_map_.begin();
        iter != ui_resource_client_map_.end();
        ++iter) {
     UIResourceLost(iter->first);
   }
 }
 
 }  // namespace cc