[Android] Port Scroller.java to C++ and use for fling animations

content/child/android/child_jni_registrar.cc

-// Copyright 2013 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.
-
-#include "content/child/android/child_jni_registrar.h"
-
-#include "base/android/jni_android.h"
-#include "base/android/jni_registrar.h"
-#include "webkit/child/fling_animator_impl_android.h"
-
-namespace {
-base::android::RegistrationMethod kContentRegisteredMethods[] = {
-  { "FlingAnimator", webkit_glue::FlingAnimatorImpl::RegisterJni },
-};
-
-}  // namespace
-
-namespace content {
-namespace android {
-
-bool RegisterChildJni(JNIEnv* env) {
-  return RegisterNativeMethods(env, kContentRegisteredMethods,
-                               arraysize(kContentRegisteredMethods));
-}
-
-}  // namespace android
-}  // namespace content