WIP - compositor worker mega patch.

cc/blink/BUILD.gn

Index: cc/blink/BUILD.gn
diff --git a/cc/blink/BUILD.gn b/cc/blink/BUILD.gn
index a501f5e642acc89926d1c265f69b3911924c06a1..c2e247e51d741e8b410a0fc08aed5764f41b7bff 100644
--- a/cc/blink/BUILD.gn
+++ b/cc/blink/BUILD.gn
@@ -11,6 +11,8 @@ component("blink") {
   sources = [
     "cc_blink_export.h",
     "context_provider_web_context.h",
+    "mutation_conversions.cc",
+    "mutation_conversions.h",
     "scrollbar_impl.cc",
     "scrollbar_impl.h",
     "web_animation_curve_common.cc",
@@ -21,6 +23,10 @@ component("blink") {
     "web_compositor_animation_player_impl.h",
     "web_compositor_animation_timeline_impl.cc",
     "web_compositor_animation_timeline_impl.h",
+    "web_compositor_mutable_state_impl.cc",
+    "web_compositor_mutable_state_impl.h",
+    "web_compositor_mutable_state_provider_impl.cc",
+    "web_compositor_mutable_state_provider_impl.h",
     "web_compositor_support_impl.cc",
     "web_compositor_support_impl.h",
     "web_content_layer_impl.cc",
@@ -43,6 +49,8 @@ component("blink") {
     "web_layer_impl.h",
     "web_layer_impl_fixed_bounds.cc",
     "web_layer_impl_fixed_bounds.h",
+    "web_mutator_client_impl.cc",
+    "web_mutator_client_impl.h",
     "web_scroll_offset_animation_curve_impl.cc",
     "web_scroll_offset_animation_curve_impl.h",
     "web_scrollbar_layer_impl.cc",
@@ -78,6 +86,7 @@ if (!is_mac) {
   test("cc_blink_unittests") {
     sources = [
       "web_animation_unittest.cc",
+      "web_compositor_mutable_state_impl_unittest.cc",
       "web_float_animation_curve_unittest.cc",
       "web_layer_impl_fixed_bounds_unittest.cc",