android: move overscroll effects to ui/

content/browser/android/overscroll_refresh.cc

Index: content/browser/android/overscroll_refresh.cc
diff --git a/content/browser/android/overscroll_refresh.cc b/content/browser/android/overscroll_refresh.cc
deleted file mode 100644
index c2a1453bc1750eea5e49f337c65f9601f7fe1667..0000000000000000000000000000000000000000
--- a/content/browser/android/overscroll_refresh.cc
+++ /dev/null
@@ -1,104 +0,0 @@
-// 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.
-
-#include "content/browser/android/overscroll_refresh.h"
-
-#include "base/logging.h"
-
-namespace content {
-namespace {
-
-// Experimentally determined constant used to allow activation even if touch
-// release results in a small upward fling (quite common during a slow scroll).
-const float kMinFlingVelocityForActivation = -500.f;
-
-}  // namespace
-
-OverscrollRefresh::OverscrollRefresh(OverscrollRefreshHandler* handler)
-    : scrolled_to_top_(true),
-      overflow_y_hidden_(false),
-      scroll_consumption_state_(DISABLED),
-      handler_(handler) {
-  DCHECK(handler);
-}
-
-OverscrollRefresh::~OverscrollRefresh() {
-}
-
-void OverscrollRefresh::Reset() {
-  scroll_consumption_state_ = DISABLED;
-  handler_->PullReset();
-}
-
-void OverscrollRefresh::OnScrollBegin() {
-  ReleaseWithoutActivation();
-  if (scrolled_to_top_ && !overflow_y_hidden_)
-    scroll_consumption_state_ = AWAITING_SCROLL_UPDATE_ACK;
-}
-
-void OverscrollRefresh::OnScrollEnd(const gfx::Vector2dF& scroll_velocity) {
-  bool allow_activation = scroll_velocity.y() > kMinFlingVelocityForActivation;
-  Release(allow_activation);
-}
-
-void OverscrollRefresh::OnScrollUpdateAck(bool was_consumed) {
-  if (scroll_consumption_state_ != AWAITING_SCROLL_UPDATE_ACK)
-    return;
-
-  if (was_consumed) {
-    scroll_consumption_state_ = DISABLED;
-    return;
-  }
-
-  scroll_consumption_state_ = handler_->PullStart() ? ENABLED : DISABLED;
-}
-
-bool OverscrollRefresh::WillHandleScrollUpdate(
-    const gfx::Vector2dF& scroll_delta) {
-  switch (scroll_consumption_state_) {
-    case DISABLED:
-      return false;
-
-    case AWAITING_SCROLL_UPDATE_ACK:
-      // If the initial scroll motion is downward, never allow activation.
-      if (scroll_delta.y() <= 0)
-        scroll_consumption_state_ = DISABLED;
-      return false;
-
-    case ENABLED:
-      handler_->PullUpdate(scroll_delta.y());
-      return true;
-  }
-
-  NOTREACHED() << "Invalid overscroll state: " << scroll_consumption_state_;
-  return false;
-}
-
-void OverscrollRefresh::ReleaseWithoutActivation() {
-  bool allow_activation = false;
-  Release(allow_activation);
-}
-
-bool OverscrollRefresh::IsActive() const {
-  return scroll_consumption_state_ == ENABLED;
-}
-
-bool OverscrollRefresh::IsAwaitingScrollUpdateAck() const {
-  return scroll_consumption_state_ == AWAITING_SCROLL_UPDATE_ACK;
-}
-
-void OverscrollRefresh::OnFrameUpdated(
-    const gfx::Vector2dF& content_scroll_offset,
-    bool root_overflow_y_hidden) {
-  scrolled_to_top_ = content_scroll_offset.y() == 0;
-  overflow_y_hidden_ = root_overflow_y_hidden;
-}
-
-void OverscrollRefresh::Release(bool allow_refresh) {
-  if (scroll_consumption_state_ == ENABLED)
-    handler_->PullRelease(allow_refresh);
-  scroll_consumption_state_ = DISABLED;
-}
-
-}  // namespace content