cc: Implement geometry-based tile eviction

cc/resources/eviction_tile_priority_queue.cc

Index: cc/resources/eviction_tile_priority_queue.cc
diff --git a/cc/resources/eviction_tile_priority_queue.cc b/cc/resources/eviction_tile_priority_queue.cc
index 9f05e816764613ee7424cff8bff3d6f6376e8430..eb68ff10b13a7e903865535b61472022d5a20645 100644
--- a/cc/resources/eviction_tile_priority_queue.cc
+++ b/cc/resources/eviction_tile_priority_queue.cc
@@ -213,6 +213,16 @@ EvictionTilePriorityQueue::PairedPictureLayerQueue::NextTileIteratorTree(
   const TilePriority& pending_priority =
       pending_tile->priority_for_tree_priority(tree_priority);
 
+  if (active_priority.priority_bin == pending_priority.priority_bin) {

[vmpstr, 2014/11/19 16:47:58]

*

+    if (active_tile->required_for_activation()) {
+      if (!pending_tile->required_for_activation())
+        return PENDING_TREE;
+    } else {
+      if (pending_tile->required_for_activation())
+        return ACTIVE_TREE;
+    }
+  }
+
   if (pending_priority.IsHigherPriorityThan(active_priority))
     return ACTIVE_TREE;
   return PENDING_TREE;