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 7ec512a5e50e110a7080e8772f2577dc3a5c07da..649ff1a59ebe505b1c6827d0d5431805cd1a93b9 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) {
 }
 
@@ -54,6 +55,7 @@ void NativeViewHost::Attach(gfx::NativeView native_view) {
   Widget* widget = Widget::GetWidgetForNativeView(native_view);
   if (widget)
     widget->SetNativeWindowProperty(kWidgetNativeViewHostKey, this);
+  native_wrapper_->NativeViewAttached();
 }
 
 void NativeViewHost::Detach() {
@@ -65,6 +67,74 @@ void NativeViewHost::SetPreferredSize(const gfx::Size& size) {
   PreferredSizeChanged();
 }
 
+float NativeViewHost::GetWidthScaleFactor() const {
+  float ret_val = 0.0;
+  switch (fast_resize_gravity_) {
+    case GRAVITY_NORTHWEST:
+      ret_val = 0.0;

[sky, 2013/09/26 22:10:54]

There is no point in assigning to ret_val, break, return. Instead just return.
Same comment in GetHeightScaleFactor.

[rharrison, 2013/09/30 20:48:45]

Done.

+      break;
+    case GRAVITY_NORTH:
+      ret_val = 0.5;
+      break;
+    case GRAVITY_NORTHEAST:
+      ret_val = 1.0;
+      break;
+    case GRAVITY_EAST:
+      ret_val = 1.0;
+      break;
+    case GRAVITY_SOUTHEAST:
+      ret_val = 1.0;
+      break;
+    case GRAVITY_SOUTH:
+      ret_val = 0.5;
+      break;
+    case GRAVITY_SOUTHWEST:
+      ret_val = 0.0;
+      break;
+    case GRAVITY_WEST:
+      ret_val = 0.0;
+      break;
+    case GRAVITY_CENTER:
+      ret_val = 0.5;
+      break;
+  }
+  return ret_val;
+}
+
+float NativeViewHost::GetHeightScaleFactor() const {
+  float ret_val = 0.0;
+  switch (fast_resize_gravity_) {
+    case GRAVITY_NORTHWEST:
+      ret_val = 0.0;
+      break;
+    case GRAVITY_NORTH:
+      ret_val = 0.0;
+      break;
+    case GRAVITY_NORTHEAST:
+      ret_val = 0.0;
+      break;
+    case GRAVITY_EAST:
+      ret_val = 0.5;
+      break;
+    case GRAVITY_SOUTHEAST:
+      ret_val = 1.0;
+      break;
+    case GRAVITY_SOUTH:
+      ret_val = 1.0;
+      break;
+    case GRAVITY_SOUTHWEST:
+      ret_val = 1.0;
+      break;
+    case GRAVITY_WEST:
+      ret_val = 0.5;
+      break;
+    case GRAVITY_CENTER:
+      ret_val = 0.5;
+      break;
+  }
+  return ret_val;
+}
+
 void NativeViewHost::NativeViewDestroyed() {
   // Detach so we can clear our state and notify the native_wrapper_ to release
   // ref on the native view.