cc: Change TileManager iterators to be queues.

cc/resources/tile_manager_perftest.cc

Index: cc/resources/tile_manager_perftest.cc
diff --git a/cc/resources/tile_manager_perftest.cc b/cc/resources/tile_manager_perftest.cc
index 3b2df2a914bf163d10b8dc1457aad557426ab1c0..3f583f477ae3ba669e885d942c073c81198551a9 100644
--- a/cc/resources/tile_manager_perftest.cc
+++ b/cc/resources/tile_manager_perftest.cc
@@ -180,13 +180,13 @@ class TileManagerPerfTest : public testing::Test {
     timer_.Reset();
     do {
       int count = tile_count;
-      for (TileManager::RasterTileIterator it(tile_manager(),
-                                              SAME_PRIORITY_FOR_BOTH_TREES);
-           it && count;
-           ++it) {
-        --count;
+      RasterTilePriorityQueue queue;
+      host_impl_.BuildRasterQueue(&queue, SAME_PRIORITY_FOR_BOTH_TREES);
+      while (count--) {
+        ASSERT_FALSE(queue.IsEmpty());
+        ASSERT_TRUE(queue.Top() != NULL);
+        queue.Pop();
       }
-      ASSERT_EQ(0, count);
       timer_.NextLap();
     } while (!timer_.HasTimeLimitExpired());