CC Animation: Make cc/animation an independent GN component.

blimp/client/support/compositor/BUILD.gn

 # 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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 source_set("compositor") {
@@ skipping 16 matching lines @@
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//gpu/command_buffer/client:gles2_implementation",
     "//gpu/ipc:gl_in_process_context",
     "//gpu/ipc/common",
     "//ui/gl",
   ]
 
   deps = [
     "//blimp/client/public:public_headers",
+    "//cc/animation",
     "//cc/surfaces",
     "//gpu/skia_bindings",
     "//skia",
     "//ui/gfx:memory_buffer",
   ]
 }