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 6b7472f4f52fc7ddc6ce532587c73e7ac16957ee..fa0bd60bad38417f06f49ea5df21b42dc17b3dcb 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -652,6 +652,8 @@ cc_static_library("test_support") {
     "test/test_occlusion_tracker.h",
     "test/test_shared_bitmap_manager.cc",
     "test/test_shared_bitmap_manager.h",
+    "test/test_skcanvas.cc",
+    "test/test_skcanvas.h",
     "test/test_task_graph_runner.cc",
     "test/test_task_graph_runner.h",
     "test/test_texture.cc",
@@ -769,6 +771,7 @@ 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",
@@ -939,6 +942,7 @@ cc_test("cc_perftests") {
     "//cc/ipc",
     "//cc/ipc:interfaces",
     "//cc/paint",
+    "//cc/paint",
     "//cc/surfaces",
     "//cc/surfaces:surface_id",
     "//gpu",