Move more sources from modules.gypi to subdirectories.

third_party/WebKit/Source/modules/compositorworker/BUILD.gn

Index: third_party/WebKit/Source/modules/compositorworker/BUILD.gn
diff --git a/third_party/WebKit/Source/modules/compositorworker/BUILD.gn b/third_party/WebKit/Source/modules/compositorworker/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..3a11064928272d933b6e89e943049b20bd8733c3
--- /dev/null
+++ b/third_party/WebKit/Source/modules/compositorworker/BUILD.gn
@@ -0,0 +1,28 @@
+# Copyright 2016 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("//third_party/WebKit/Source/modules/modules.gni")
+
+blink_modules_sources("compositorworker") {
+  sources = [
+    "AbstractAnimationWorkletThread.cpp",
+    "AbstractAnimationWorkletThread.h",
+    "AnimationWorklet.cpp",
+    "AnimationWorklet.h",
+    "AnimationWorkletGlobalScope.cpp",
+    "AnimationWorkletGlobalScope.h",
+    "AnimationWorkletThread.cpp",
+    "AnimationWorkletThread.h",
+    "CompositorWorker.cpp",
+    "CompositorWorker.h",
+    "CompositorWorkerGlobalScope.cpp",
+    "CompositorWorkerGlobalScope.h",
+    "CompositorWorkerMessagingProxy.cpp",
+    "CompositorWorkerMessagingProxy.h",
+    "CompositorWorkerThread.cpp",
+    "CompositorWorkerThread.h",
+    "WindowAnimationWorklet.cpp",
+    "WindowAnimationWorklet.h",
+  ]
+}