Include viewport clip in visible rect of unclipped surfaces (2)

cc/trees/property_tree.cc

 // Copyright 2014 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 <stddef.h>
 
 #include <set>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 1094 matching lines @@
 void ClipTree::SetViewportClip(gfx::RectF viewport_rect) {
   if (size() < 2)
     return;
   ClipNode* node = Node(1);
   if (viewport_rect == node->clip)
     return;
   node->clip = viewport_rect;
   set_needs_update(true);
 }
 
-gfx::RectF ClipTree::ViewportClip() {
+gfx::RectF ClipTree::ViewportClip() const {
   const unsigned long min_size = 1;
   DCHECK_GT(size(), min_size);
   return Node(kViewportNodeId)->clip;
 }
 
 bool ClipTree::operator==(const ClipTree& other) const {
   return PropertyTree::operator==(other);
 }
 
 void ClipTree::ToProtobuf(proto::PropertyTree* proto) const {
@@ skipping 1122 matching lines @@
     from_target.ConcatTransform(draw_transforms.from_target);
     from_target.Scale(effect_node->surface_contents_scale.x(),
                       effect_node->surface_contents_scale.y());
     DCHECK(from_target.ApproximatelyEqual(*transform) ||
            !draw_transforms.invertible);
   }
   return success;
 }
 
 }  // namespace cc