Re-Reland: Implement features in NativeViewHostAura for scroll end effect

ui/views/controls/native/native_view_host.cc

Index: ui/views/controls/native/native_view_host.cc
diff --git a/ui/views/controls/native/native_view_host.cc b/ui/views/controls/native/native_view_host.cc
index 760f856cd2783b37b5c23fb4558675f83c1643dc..db83a847b6b8921b0eb6746200643dc2d93987a5 100644
--- a/ui/views/controls/native/native_view_host.cc
+++ b/ui/views/controls/native/native_view_host.cc
@@ -33,6 +33,7 @@ NativeViewHost::NativeViewHost()
     : native_view_(NULL),
       fast_resize_(false),
       fast_resize_at_last_layout_(false),
+      fast_resize_gravity_(GRAVITY_NORTHWEST),
       focus_view_(NULL) {
 }
 
@@ -47,11 +48,9 @@ void NativeViewHost::Attach(gfx::NativeView native_view) {
   // be seen as focused when the native view receives focus.
   if (!focus_view_)
     focus_view_ = this;
-  native_wrapper_->NativeViewWillAttach();
-  Widget::ReparentNativeView(native_view_, GetWidget()->GetNativeView());
+  native_wrapper_->AttachNativeView();
   Layout();
-
-  Widget* widget = Widget::GetWidgetForNativeView(native_view);
+  Widget* widget = Widget::GetWidgetForNativeView(native_view_);
   if (widget)
     widget->SetNativeWindowProperty(kWidgetNativeViewHostKey, this);
 }
@@ -65,6 +64,56 @@ void NativeViewHost::SetPreferredSize(const gfx::Size& size) {
   PreferredSizeChanged();
 }
 
+float NativeViewHost::GetWidthScaleFactor() const {
+  switch (fast_resize_gravity_) {
+    case GRAVITY_NORTHWEST:
+      return 0.0;
+    case GRAVITY_NORTH:
+      return 0.5;
+    case GRAVITY_NORTHEAST:
+      return 1.0;
+    case GRAVITY_EAST:
+      return 1.0;
+    case GRAVITY_SOUTHEAST:
+      return 1.0;
+    case GRAVITY_SOUTH:
+      return 0.5;
+    case GRAVITY_SOUTHWEST:
+      return 0.0;
+    case GRAVITY_WEST:
+      return 0.0;
+    case GRAVITY_CENTER:
+      return 0.5;
+  }
+  NOTREACHED();
+  return 0.0;
+}
+
+float NativeViewHost::GetHeightScaleFactor() const {
+  switch (fast_resize_gravity_) {
+    case GRAVITY_NORTHWEST:
+      return 0.0;
+    case GRAVITY_NORTH:
+      return 0.0;
+    case GRAVITY_NORTHEAST:
+      return 0.0;
+    case GRAVITY_EAST:
+      return 0.5;
+    case GRAVITY_SOUTHEAST:
+      return 1.0;
+    case GRAVITY_SOUTH:
+      return 1.0;
+    case GRAVITY_SOUTHWEST:
+      return 1.0;
+    case GRAVITY_WEST:
+      return 0.5;
+    case GRAVITY_CENTER:
+      return 0.5;
+  }
+  NOTREACHED();
+  return 0.0;
+}
+
 void NativeViewHost::NativeViewDestroyed() {
   // Detach so we can clear our state and notify the native_wrapper_ to release
   // ref on the native view.