cc: Do not ignore layers without valid priorities during eviction.

cc/resources/picture_layer_tiling_perftest.cc

Index: cc/resources/picture_layer_tiling_perftest.cc
diff --git a/cc/resources/picture_layer_tiling_perftest.cc b/cc/resources/picture_layer_tiling_perftest.cc
index 8f91763c79f0159bb99c8311ad85b4a5c40ffce8..622e3402c5bf6edd9e67aea2f37d8d713aee16b5 100644
--- a/cc/resources/picture_layer_tiling_perftest.cc
+++ b/cc/resources/picture_layer_tiling_perftest.cc
@@ -197,7 +197,9 @@ class PictureLayerTilingPerfTest : public testing::Test {
       PictureLayerTiling::TilingEvictionTileIterator it(
           picture_layer_tiling_.get(),
           priorities[priority_count],
-          PictureLayerTiling::NOW);
+          PictureLayerTiling::NOW,
+          true,
+          true);
       priority_count = (priority_count + 1) % arraysize(priorities);
       timer_.NextLap();
     } while (!timer_.HasTimeLimitExpired());
@@ -242,7 +244,9 @@ class PictureLayerTilingPerfTest : public testing::Test {
       PictureLayerTiling::TilingEvictionTileIterator it(
           picture_layer_tiling_.get(),
           priorities[priority_count],
-          PictureLayerTiling::EVENTUALLY);
+          PictureLayerTiling::EVENTUALLY,
+          true,
+          true);
       while (count--) {
         ASSERT_TRUE(it) << "count: " << count;
         ASSERT_TRUE(*it != NULL) << "count: " << count;