cc: Remove unused metrics from RenderingStats.

cc/resources/picture_pile_impl_unittest.cc

Index: cc/resources/picture_pile_impl_unittest.cc
diff --git a/cc/resources/picture_pile_impl_unittest.cc b/cc/resources/picture_pile_impl_unittest.cc
index ed3307e5ea47e42bd44da7474fa3bc04f15141a0..987b143bcc897a556aa44cc513c073cf9fb6f47b 100644
--- a/cc/resources/picture_pile_impl_unittest.cc
+++ b/cc/resources/picture_pile_impl_unittest.cc
@@ -665,7 +665,6 @@ TEST(PicturePileImplTest, PixelRefIteratorMultiplePictures) {
   pile->RerecordPile();
 
   FakeContentLayerClient content_layer_clients[2][2];
-  FakeRenderingStatsInstrumentation stats_instrumentation;
   scoped_refptr<Picture> pictures[2][2];
   for (int y = 0; y < 2; ++y) {
     for (int x = 0; x < 2; ++x) {
@@ -679,7 +678,7 @@ TEST(PicturePileImplTest, PixelRefIteratorMultiplePictures) {
       pictures[y][x]->Record(
           &content_layer_clients[y][x],
           tile_grid_info);
-      pictures[y][x]->GatherPixelRefs(tile_grid_info, &stats_instrumentation);
+      pictures[y][x]->GatherPixelRefs(tile_grid_info);
       pile->AddPictureToRecording(0, 0, pictures[y][x]);
     }
   }
@@ -748,9 +747,10 @@ TEST(PicturePileImpl, RasterContentsOpaque) {
   bitmap.allocPixels();
   SkCanvas canvas(bitmap);
 
-  PicturePileImpl::RasterStats raster_stats;
+  FakeRenderingStatsInstrumentation rendering_stats_instrumentation;
+
   pile->RasterToBitmap(
-      &canvas, canvas_rect, contents_scale, &raster_stats);
+      &canvas, canvas_rect, contents_scale, &rendering_stats_instrumentation);
 
   SkColor* pixels = reinterpret_cast<SkColor*>(bitmap.getPixels());
   int num_pixels = bitmap.width() * bitmap.height();
@@ -784,9 +784,9 @@ TEST(PicturePileImpl, RasterContentsTransparent) {
   bitmap.allocPixels();
   SkCanvas canvas(bitmap);
 
-  PicturePileImpl::RasterStats raster_stats;
+  FakeRenderingStatsInstrumentation rendering_stats_instrumentation;
   pile->RasterToBitmap(
-      &canvas, canvas_rect, contents_scale, &raster_stats);
+      &canvas, canvas_rect, contents_scale, &rendering_stats_instrumentation);
 
   SkColor* pixels = reinterpret_cast<SkColor*>(bitmap.getPixels());
   int num_pixels = bitmap.width() * bitmap.height();