Mozart: Make Snapshot immutable.

services/gfx/compositor/graph/node_def.cc

 // Copyright 2015 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 "services/gfx/compositor/graph/node_def.h"
 
 #include <ostream>
 
 #include "base/logging.h"
 #include "mojo/services/gfx/composition/cpp/formatting.h"
@@ skipping 126 matching lines @@
                                           const Func& func) const {
   DCHECK(content);
   DCHECK(snapshot);
 
   switch (combinator_) {
     // MERGE: All or nothing.
     case Combinator::MERGE: {
       for (uint32_t child_node_id : child_node_ids_) {
         const NodeDef* child_node = content->GetNode(child_node_id);
         DCHECK(child_node);
-        DCHECK(!snapshot->IsBlocked(child_node));
+        DCHECK(!snapshot->IsNodeBlocked(child_node));
         if (!func(child_node))
           return;
       }
       return;
     }
 
     // PRUNE: Silently discard blocked children.
     case Combinator::PRUNE: {
       for (uint32_t child_node_id : child_node_ids_) {
         const NodeDef* child_node = content->GetNode(child_node_id);
         DCHECK(child_node);
-        if (!snapshot->IsBlocked(child_node) && !func(child_node))
+        if (!snapshot->IsNodeBlocked(child_node) && !func(child_node))
           return;
       }
       return;
     }
 
     // FALLBACK: Keep only the first unblocked child.
     case Combinator::FALLBACK: {
       if (child_node_ids_.empty())
         return;
       for (uint32_t child_node_id : child_node_ids_) {
         const NodeDef* child_node = content->GetNode(child_node_id);
         DCHECK(child_node);
-        if (!snapshot->IsBlocked(child_node)) {
+        if (!snapshot->IsNodeBlocked(child_node)) {
           func(child_node);  // don't care about the result because we
           return;            // always stop after the first one
         }
       }
       NOTREACHED();
       return;
     }
 
     default: {
       NOTREACHED();
@@ skipping 219 matching lines @@
 
   SkPaint paint;
   SetPaintForBlend(&paint, blend_.get());
 
   canvas->saveLayer(SkRect::MakeWH(size_.width, size_.height), &paint);
   NodeDef::RecordPictureInner(content, snapshot, canvas);
   canvas->restore();
 }
 
 }  // namespace compositor