[Android] Suppress overscroll for unscrollable axes in the browser

cc/layers/viewport.cc

 // Copyright 2015 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 "cc/layers/viewport.h"
 
 #include "base/logging.h"
 #include "cc/input/top_controls_manager.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/layer_tree_impl.h"
@@ skipping 140 matching lines @@
 
 gfx::Vector2dF Viewport::AdjustOverscroll(const gfx::Vector2dF& delta) const {
   const float kEpsilon = 0.1f;
   gfx::Vector2dF adjusted = delta;
 
   if (std::abs(adjusted.x()) < kEpsilon)
     adjusted.set_x(0.0f);
   if (std::abs(adjusted.y()) < kEpsilon)
     adjusted.set_y(0.0f);
 
-  // Disable overscroll on axes which are impossible to scroll.
-  if (host_impl_->settings().report_overscroll_only_for_scrollable_axes) {
-    if (std::abs(MaxTotalScrollOffset().x()) <= kEpsilon ||
-        !InnerScrollLayer()->user_scrollable_horizontal())
-      adjusted.set_x(0.0f);
-    if (std::abs(MaxTotalScrollOffset().y()) <= kEpsilon ||
-        !InnerScrollLayer()->user_scrollable_vertical())
-      adjusted.set_y(0.0f);
-  }
-
   return adjusted;
 }
 
 gfx::ScrollOffset Viewport::MaxTotalScrollOffset() const {
   gfx::ScrollOffset offset;
 
   offset += InnerScrollLayer()->MaxScrollOffset();
 
   if (OuterScrollLayer())
     offset += OuterScrollLayer()->MaxScrollOffset();
@@ skipping 14 matching lines @@
 
 LayerImpl* Viewport::InnerScrollLayer() const {
   return host_impl_->InnerViewportScrollLayer();
 }
 
 LayerImpl* Viewport::OuterScrollLayer() const {
   return host_impl_->OuterViewportScrollLayer();
 }
 
 }  // namespace cc