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

android_webview/BUILD.gn

Index: android_webview/BUILD.gn
diff --git a/android_webview/BUILD.gn b/android_webview/BUILD.gn
index a0e40238e6a2677465bc130f61fcc0f1cc42ab10..3b9c61ce62e16bfb511e2e07bdf5bd451e19807d 100644
--- a/android_webview/BUILD.gn
+++ b/android_webview/BUILD.gn
@@ -473,6 +473,7 @@ source_set("common") {
     ":generate_components_strings",
     "//android_webview/common:version",
     "//android_webview/native:native",
+    "//cc/animation",

[boliu, 2016/11/17 14:50:43]

this is actually not correct I believe

a target should only need to declare its *direct* dependencies. afaict I don't
see any android_webview code including things from cc/animation?

If cc/animation is a dependency of cc/surfaces, then it should be declared a
dependency of cc/surfaces and that will be transitively pulled in here

[loyso (OOO), 2016/11/17 23:45:09]

Done.

     "//cc/surfaces",
     "//components/autofill/content/renderer",
     "//components/cdm/browser",