SetNeedsRedraw directly when updating a visible tile.

cc/BUILD.gn

Index: cc/BUILD.gn
diff --git a/cc/BUILD.gn b/cc/BUILD.gn
index 0b59c7ed66f75eb3c4cbff198d29d1ea5bb756dc..d0df5f2cacaab03c02d63a04de38932f7b964769 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -544,6 +544,8 @@ 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",
@@ -628,6 +630,8 @@ source_set("test_support") {
     "test/test_tile_priorities.h",
     "test/test_web_graphics_context_3d.cc",
     "test/test_web_graphics_context_3d.h",
+    "test/thread_blocker.cc",
+    "test/thread_blocker.h",
     "test/tiled_layer_test_common.cc",
     "test/tiled_layer_test_common.h",
   ]