Introduce AnimationWorkletProxyClient and necessary plumbing to get it in worklet messaging proxy.

third_party/WebKit/Source/web/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//third_party/WebKit/Source/modules/modules.gni")
@@ skipping 18 matching lines @@
     "//build/config/compiler:wexit_time_destructors",
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
     "//third_party/WebKit/Source:non_test_config",
     "//third_party/WebKit/Source/core:blink_core_pch",
   ]
 
   defines = [ "BLINK_WEB_IMPLEMENTATION=1" ]
 
   sources = [
+    "AnimationWorkletProxyClientImpl.cpp",
+    "AnimationWorkletProxyClientImpl.h",
     "AssertMatchingEnums.cpp",
     "AudioOutputDeviceClientImpl.cpp",
     "AudioOutputDeviceClientImpl.h",
     "ChromeClientImpl.cpp",
     "ChromeClientImpl.h",
     "ColorChooserPopupUIController.cpp",
     "ColorChooserPopupUIController.h",
     "ColorChooserUIController.cpp",
     "ColorChooserUIController.h",
     "CompositionUnderlineBuilder.h",
     "CompositionUnderlineVectorBuilder.cpp",
     "CompositionUnderlineVectorBuilder.h",
+    "CompositorAnimator.h",
     "CompositorMutatorImpl.cpp",
     "CompositorMutatorImpl.h",
-    "CompositorProxyClientImpl.cpp",
-    "CompositorProxyClientImpl.h",
+    "CompositorWorkerProxyClientImpl.cpp",
+    "CompositorWorkerProxyClientImpl.h",
     "ContextFeaturesClientImpl.cpp",
     "ContextFeaturesClientImpl.h",
     "ContextMenuAllowedScope.cpp",
     "ContextMenuAllowedScope.h",
     "ContextMenuClientImpl.cpp",
     "ContextMenuClientImpl.h",
     "DatabaseClientImpl.cpp",
     "DatabaseClientImpl.h",
     "DateTimeChooserImpl.cpp",
     "DateTimeChooserImpl.h",
@@ skipping 375 matching lines @@
 
   if (is_android) {
     deps += [
       "//base:base_java",
       "//content/public/android:content_java",
       "//content/shell/android:content_shell_assets",
       "//net/android:net_java",
     ]
   }
 }