Change ScrollbarLayer to use UI resource

cc/trees/layer_tree_host_impl.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_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
@@ skipping 2482 matching lines @@
     scoped_refptr<UIResourceBitmap> bitmap) {
   DCHECK_GT(uid, 0);
   DCHECK_EQ(bitmap->GetFormat(), UIResourceBitmap::RGBA8);
 
   // Allow for multiple creation requests with the same UIResourceId.  The
   // previous resource is simply deleted.
   ResourceProvider::ResourceId id = ResourceIdForUIResource(uid);
   if (id)
     DeleteUIResource(uid);
   id = resource_provider_->CreateResource(
-      bitmap->GetSize(), GL_RGBA, ResourceProvider::TextureUsageAny);
+      bitmap->GetSize(),
+      resource_provider_->best_texture_format(),
+      ResourceProvider::TextureUsageAny);
 
   ui_resource_map_[uid] = id;
   resource_provider_->SetPixels(id,
                                 reinterpret_cast<uint8_t*>(bitmap->GetPixels()),
                                 gfx::Rect(bitmap->GetSize()),
                                 gfx::Rect(bitmap->GetSize()),
                                 gfx::Vector2d(0, 0));
 }
 
 void LayerTreeHostImpl::DeleteUIResource(UIResourceId uid) {
   ResourceProvider::ResourceId id = ResourceIdForUIResource(uid);
   if (id) {
     resource_provider_->DeleteResource(id);
     ui_resource_map_.erase(uid);
   }
 }
 
 ResourceProvider::ResourceId LayerTreeHostImpl::ResourceIdForUIResource(
     UIResourceId uid) const {
   UIResourceMap::const_iterator iter = ui_resource_map_.find(uid);
   if (iter != ui_resource_map_.end())
     return iter->second;
   return 0;
 }
 
 }  // namespace cc