cc: Remove PicturePile and PicturePileImpl.

cc/BUILD.gn

Index: cc/BUILD.gn
diff --git a/cc/BUILD.gn b/cc/BUILD.gn
index 922ac34aafe60e8b8be1b511aacfcb663c482830..74b1dde62cd799f1660e2723fbeee210d6e492c4 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -310,10 +310,6 @@ component("cc") {
     "playback/largest_display_item.h",
     "playback/picture.cc",
     "playback/picture.h",
-    "playback/picture_pile.cc",
-    "playback/picture_pile.h",
-    "playback/picture_pile_impl.cc",
-    "playback/picture_pile_impl.h",
     "playback/raster_source.h",
     "playback/raster_source_helper.cc",
     "playback/raster_source_helper.h",
@@ -552,6 +548,8 @@ source_set("test_support") {
     "test/fake_delegated_renderer_layer.h",
     "test/fake_delegated_renderer_layer_impl.cc",
     "test/fake_delegated_renderer_layer_impl.h",
+    "test/fake_display_list_raster_source.cc",
+    "test/fake_display_list_raster_source.h",
     "test/fake_display_list_recording_source.cc",
     "test/fake_display_list_recording_source.h",
     "test/fake_external_begin_frame_source.cc",
@@ -577,10 +575,6 @@ source_set("test_support") {
     "test/fake_picture_layer_impl.h",
     "test/fake_picture_layer_tiling_client.cc",
     "test/fake_picture_layer_tiling_client.h",
-    "test/fake_picture_pile.cc",
-    "test/fake_picture_pile.h",
-    "test/fake_picture_pile_impl.cc",
-    "test/fake_picture_pile_impl.h",
     "test/fake_proxy.cc",
     "test/fake_proxy.h",
     "test/fake_renderer_client.cc",
@@ -786,8 +780,6 @@ test("cc_unittests") {
     "playback/display_item_list_unittest.cc",
     "playback/display_list_raster_source_unittest.cc",
     "playback/display_list_recording_source_unittest.cc",
-    "playback/picture_pile_impl_unittest.cc",
-    "playback/picture_pile_unittest.cc",
     "playback/picture_unittest.cc",
     "playback/recording_source_unittest.cc",
     "quads/draw_polygon_unittest.cc",
@@ -893,7 +885,6 @@ test("cc_perftests") {
   sources = [
     "layers/layer_perftest.cc",
     "layers/picture_layer_impl_perftest.cc",
-    "playback/picture_pile_impl_perftest.cc",
     "quads/draw_quad_perftest.cc",
     "raster/task_graph_runner_perftest.cc",
     "raster/texture_compressor_perftest.cc",