cc: Start using raster/eviction iterators in tile manager

cc/layers/picture_layer_impl.cc

 // Copyright 2012 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/layers/picture_layer_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/time/time.h"
@@ skipping 1398 matching lines @@
   if (!iterators_[index] || iterators_[index].get_type() != tile_type)
     ++(*this);
 }
 
 PictureLayerImpl::LayerRasterTileIterator::~LayerRasterTileIterator() {}
 
 PictureLayerImpl::LayerRasterTileIterator::operator bool() const {
   return layer_ && static_cast<size_t>(current_stage_) < arraysize(stages_);
 }
 
+bool PictureLayerImpl::LayerRasterTileIterator::HasTilesRequiredForActivation()
+    const {
+  if (!*this)
+    return false;
+
+  int stage_count = arraysize(stages_);
+  for (int stage = current_stage_; stage < stage_count; ++stage) {
+    IteratorType index = stages_[stage].iterator_type;
+    if (iterators_[index].HasTilesRequiredForActivation())
+      return true;
+  }
+  return false;
+}
+
 PictureLayerImpl::LayerRasterTileIterator&
 PictureLayerImpl::LayerRasterTileIterator::
 operator++() {
   IteratorType index = stages_[current_stage_].iterator_type;
   TilePriority::PriorityBin tile_type = stages_[current_stage_].tile_type;
 
   // First advance the iterator.
   if (iterators_[index])
     ++iterators_[index];
 
@@ skipping 141 matching lines @@
   return iterator_index_ < iterators_.size();
 }
 
 bool PictureLayerImpl::LayerEvictionTileIterator::IsCorrectType(
     PictureLayerTiling::TilingEvictionTileIterator* it) const {
   return it->get_type() == iteration_stage_ &&
          (**it)->required_for_activation() == required_for_activation_;
 }
 
 }  // namespace cc