[Android] Add a native pull-to-refresh overscroll effect

content/browser/android/content_view_core_impl.cc

 // Copyright 2012 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/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 740 matching lines @@
 
 gfx::Size ContentViewCoreImpl::GetViewportSizeDip() const {
   return gfx::ToCeiledSize(
       gfx::ScaleSize(GetViewportSizePix(), 1.0f / dpi_scale()));
 }
 
 float ContentViewCoreImpl::GetTopControlsLayoutHeightDip() const {
   return GetTopControlsLayoutHeightPix() / dpi_scale();
 }
 
+void ContentViewCoreImpl::SetNeedsAnimate() {
+  RenderWidgetHostViewAndroid* view = GetRenderWidgetHostViewAndroid();
+  if (view)
+    view->SetNeedsAnimate();
+}
+
 void ContentViewCoreImpl::AttachLayer(scoped_refptr<cc::Layer> layer) {
   root_layer_->InsertChild(layer, 0);
   root_layer_->SetIsDrawable(false);
 }
 
 void ContentViewCoreImpl::RemoveLayer(scoped_refptr<cc::Layer> layer) {
   layer->RemoveFromParent();
 
   if (!root_layer_->children().size())
     root_layer_->SetIsDrawable(true);
@@ skipping 547 matching lines @@
       reinterpret_cast<ui::WindowAndroid*>(window_android),
       retained_objects_set);
   return reinterpret_cast<intptr_t>(view);
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content