[Hd] Remove render tags API from HdRprimCollection.

Now Hydra and All the front-ends no longer use render tags from the collection, this change cleans up and removes that API.

Changes:
- Removed SetRenderTags(), GetRenderTags() and HasRenderTag() from HdRprimCollection.

(Internal change: 1974425)

pxr/imaging/lib/hd/rprimCollection.cpp

@@ -76,7 +76,6 @@ HdRprimCollection::HdRprimCollection(HdRprimCollection const& col)
     _name = col._name;
     _reprSelector = col._reprSelector;
     _forcedRepr = col._forcedRepr;
-    _renderTags = col._renderTags;
     _rootPaths = col._rootPaths;
     _excludePaths = col._excludePaths;
     _materialTag = col._materialTag;
@@ -150,34 +149,6 @@ HdRprimCollection::GetExcludePaths() const
     return _excludePaths;
 }
 
-void 
-HdRprimCollection::SetRenderTags(TfTokenVector const& renderTags)
-{
-    _renderTags = renderTags;
-}
-
-TfTokenVector const& 
-HdRprimCollection::GetRenderTags() const
-{
-    return _renderTags;
-}
-
-bool
-HdRprimCollection::HasRenderTag(TfToken const & renderTag) const
-{
-    if (_renderTags.empty()) {
-        return true;  
-    } 
-
-    TF_FOR_ALL (t, _renderTags) {
-        if (renderTag == *t) {
-            return true;  
-        } 
-    }
-
-    return false;
-}
-
 void 
 HdRprimCollection::SetMaterialTag(TfToken const& tag)
 {
@@ -202,9 +173,6 @@ HdRprimCollection::ComputeHash() const
     TF_FOR_ALL(pathIt, _excludePaths) {
         boost::hash_combine(h, SdfPath::Hash()(*pathIt));
     }
-    TF_FOR_ALL(rtIt, _renderTags) {
-        boost::hash_combine(h, rtIt->Hash());
-    }
 
     boost::hash_combine(h, _materialTag);
     return h;
@@ -217,7 +185,6 @@ bool HdRprimCollection::operator==(HdRprimCollection const & other) const
        && _forcedRepr == other._forcedRepr
        && _rootPaths == other._rootPaths
        && _excludePaths == other._excludePaths
-       && _renderTags == other._renderTags
        && _materialTag == other._materialTag;
 }
 

pxr/imaging/lib/hd/rprimCollection.h

@@ -163,18 +163,6 @@ class HdRprimCollection {
     HD_API
     SdfPathVector const& GetExcludePaths() const;
 
-    /// Sets the render tags that this collection will render.
-    HD_API
-    void SetRenderTags(TfTokenVector const& renderTags);
-
-    /// Returns the render tags.
-    HD_API
-    TfTokenVector const& GetRenderTags() const;
-
-    /// Returns if a tag is used by this collection
-    HD_API
-    bool HasRenderTag(TfToken const & renderTag) const;
-
     /// A MaterialTag can be used to ensure only prims whos material have
     /// a matching tag will end up in the collection. Different rendering 
     /// backends can control what material properties are useful for splitting 
@@ -217,7 +205,6 @@ class HdRprimCollection {
     TfToken _materialTag;
     SdfPathVector _rootPaths;
     SdfPathVector _excludePaths;
-    TfTokenVector _renderTags;
 };
 
 // VtValue requirements