Reland r107720 - Enable the new layer animation framework.

ui/gfx/compositor/layer_animation_element.h

Index: ui/gfx/compositor/layer_animation_element.h
diff --git a/ui/gfx/compositor/layer_animation_element.h b/ui/gfx/compositor/layer_animation_element.h
index 12697b0531ea6d67330daba8d9c1fa64b394fdb0..d38bc42375c40c162be6d55a84418edeb3329e6e 100644
--- a/ui/gfx/compositor/layer_animation_element.h
+++ b/ui/gfx/compositor/layer_animation_element.h
@@ -10,10 +10,8 @@
 
 #include "base/time.h"
 #include "ui/gfx/compositor/compositor_export.h"
-
-namespace gfx {
-class Rect;
-}  // gfx
+#include "ui/gfx/rect.h"
+#include "ui/gfx/transform.h"
 
 namespace ui {
 
@@ -31,6 +29,14 @@ class COMPOSITOR_EXPORT LayerAnimationElement {
     OPACITY
   };
 
+  struct TargetValue {
+   public:
+    TargetValue();
+    gfx::Rect bounds;
+    Transform transform;
+    float opacity;
+  };
+
   typedef std::set<AnimatableProperty> AnimatableProperties;
 
   LayerAnimationElement(const AnimatableProperties& properties,
@@ -71,6 +77,9 @@ class COMPOSITOR_EXPORT LayerAnimationElement {
   // before OnStarted or Progress.
   void Abort();
 
+  // Assigns the target value to |target|.
+  void GetTargetValue(TargetValue* target) const;
+
   // The properties that the element modifies.
   const AnimatableProperties& properties() const { return properties_; }
 
@@ -82,6 +91,7 @@ class COMPOSITOR_EXPORT LayerAnimationElement {
   // OnProgress.
   virtual void OnStart(LayerAnimationDelegate* delegate) = 0;
   virtual void OnProgress(double t, LayerAnimationDelegate* delegate) = 0;
+  virtual void OnGetTarget(TargetValue* target) const = 0;
   virtual void OnAbort() = 0;
 
  private: