Add support for tagging layers.

cc/layer.cc

 // Copyright 2010 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/layer.h"
 
 #include "cc/active_animation.h"
 #include "cc/animation_events.h"
 #include "cc/layer_animation_controller.h"
 #include "cc/layer_impl.h"
@@ skipping 40 matching lines @@
     , m_preserves3D(false)
     , m_useParentBackfaceVisibility(false)
     , m_drawCheckerboardForMissingTiles(false)
     , m_forceRenderSurface(false)
     , m_replicaLayer(0)
     , m_rasterScale(1.0)
     , m_automaticallyComputeRasterScale(false)
     , m_boundsContainPageScale(false)
     , m_layerAnimationDelegate(0)
     , m_layerScrollClient(0)
+    , m_tags(kTagNone)
 {
     if (m_layerId < 0) {
         s_nextLayerId = 1;
         m_layerId = s_nextLayerId++;
     }
 
     m_layerAnimationController = LayerAnimationController::create(m_layerId);
     m_layerAnimationController->addObserver(this);
     addLayerAnimationEventObserver(m_layerAnimationController.get());
 }
@@ skipping 768 matching lines @@
     if (contentsOpaque())
         return visibleContentRect();
     return Region();
 }
 
 ScrollbarLayer* Layer::toScrollbarLayer()
 {
     return 0;
 }
 
+void Layer::setTags(unsigned int tags)
+{
+    m_tags = tags;
+}
+
+unsigned int Layer::getTags() const
+{
+    return m_tags;
+}
+
+void Layer::addTag(Tag tag)
+{
+    m_tags |= tag;
+}
+
+bool Layer::getTag(Tag tag) const
+{
+    return m_tags & tag;
+}
+
 void sortLayers(std::vector<scoped_refptr<Layer> >::iterator, std::vector<scoped_refptr<Layer> >::iterator, void*)
 {
     // Currently we don't use z-order to decide what to paint, so there's no need to actually sort Layers.
 }
 
 }  // namespace cc