Back PaintRecord with PaintOpBuffer instead of SkPicture

cc/BUILD.gn

Index: cc/BUILD.gn
diff --git a/cc/BUILD.gn b/cc/BUILD.gn
index 6ffaeddd3670dbde3cb77e8515ba87106109ef93..59aefb873c3507a1cb76c5edd90f63b37bbb20df 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -761,6 +761,7 @@ cc_test("cc_unittests") {
     "output/texture_mailbox_deleter_unittest.cc",
     "paint/discardable_image_map_unittest.cc",
     "paint/display_item_list_unittest.cc",
+    "paint/paint_op_buffer_unittest.cc",
     "quads/draw_polygon_unittest.cc",
     "quads/draw_quad_unittest.cc",
     "quads/nine_patch_generator_unittest.cc",
@@ -931,6 +932,7 @@ cc_test("cc_perftests") {
     "//cc/ipc",
     "//cc/ipc:interfaces",
     "//cc/paint",
+    "//cc/paint",
     "//cc/surfaces",
     "//cc/surfaces:surface_id",
     "//gpu",