Animated Rotation

ui/gfx/compositor/layer.cc

Index: ui/gfx/compositor/layer.cc
diff --git a/ui/gfx/compositor/layer.cc b/ui/gfx/compositor/layer.cc
index 4f1ed24116ddf018cbb063be3a3d1d96eb190494..897c011ec3f05bd64712e7d9d8adda232749751e 100644
--- a/ui/gfx/compositor/layer.cc
+++ b/ui/gfx/compositor/layer.cc
@@ -7,6 +7,7 @@
 #include <algorithm>
 
 #include "base/logging.h"
+#include "ui/gfx/compositor/layer_observer.h"
 #include "ui/gfx/point3.h"
 
 namespace ui {
@@ -108,6 +109,14 @@ void Layer::SetCanvas(const SkCanvas& canvas, const gfx::Point& origin) {
   texture_->SetCanvas(canvas, origin, bounds_.size());
 }
 
+void Layer::AddObserver(LayerObserver* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void Layer::RemoveObserver(LayerObserver* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
 void Layer::Draw() {
   ui::TextureDrawParams texture_draw_params;
   for (Layer* layer = this; layer; layer = layer->parent_) {
@@ -152,6 +161,7 @@ void Layer::Draw() {
       bounds_.width(),
       bounds_.height() - hole_rect_.bottom()));
 #endif
+  FOR_EACH_OBSERVER(LayerObserver, observer_list_, OnDraw(this));
 }
 
 void Layer::DrawRegion(const ui::TextureDrawParams& params,