cc: Give non-drawing layers that are rasterized a lower priority.

cc/layers/picture_layer_impl_perftest.cc

Index: cc/layers/picture_layer_impl_perftest.cc
diff --git a/cc/layers/picture_layer_impl_perftest.cc b/cc/layers/picture_layer_impl_perftest.cc
index 270978d8cff28c1d7e000cfec499bd93683e3975..7db16d60b4bd98ce30a5b201b2f7589c6c0fb8c6 100644
--- a/cc/layers/picture_layer_impl_perftest.cc
+++ b/cc/layers/picture_layer_impl_perftest.cc
@@ -86,7 +86,7 @@ class PictureLayerImplPerfTest : public testing::Test {
       int count = num_tiles;
       std::unique_ptr<TilingSetRasterQueueAll> queue(
           new TilingSetRasterQueueAll(
-              pending_layer_->picture_layer_tiling_set(), false));
+              pending_layer_->picture_layer_tiling_set(), false, true));
       while (count--) {
         ASSERT_TRUE(!queue->IsEmpty()) << "count: " << count;
         ASSERT_TRUE(queue->Top().tile()) << "count: " << count;
@@ -114,7 +114,7 @@ class PictureLayerImplPerfTest : public testing::Test {
     do {
       std::unique_ptr<TilingSetRasterQueueAll> queue(
           new TilingSetRasterQueueAll(
-              pending_layer_->picture_layer_tiling_set(), false));
+              pending_layer_->picture_layer_tiling_set(), false, true));
       timer_.NextLap();
     } while (!timer_.HasTimeLimitExpired());