Implemented prototype for new ink drop specs.

ui/views/animation/ink_drop_animation_controller_factory.h

Index: ui/views/animation/ink_drop_animation_controller_factory.h
diff --git a/ui/views/animation/ink_drop_animation_controller_factory.h b/ui/views/animation/ink_drop_animation_controller_factory.h
index b199d7b8f9ec090b3b68e3775f82d7e957a96ca9..2c04037714ba2fc76c75fadf65586cbe99c95dd5 100644
--- a/ui/views/animation/ink_drop_animation_controller_factory.h
+++ b/ui/views/animation/ink_drop_animation_controller_factory.h
@@ -7,17 +7,19 @@
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
-#include "ui/views/animation/ink_drop_animation_controller.h"
 #include "ui/views/views_export.h"
 
 namespace views {
+class InkDropAnimationController;
+class InkDropHost;
 
 // A factory to create InkDropAnimationController. A different
 // InkDropAnimationController type will be created based on whether or not
 // material design is enabled.
 class VIEWS_EXPORT InkDropAnimationControllerFactory {
  public:
-  // Creates a new InkDropAnimationController.
+  // Creates a new InkDropAnimationController that might be attached to the
+  // |ink_drop_host_|.

[tdanderson, 2015/09/10 15:37:51]

Do you mean |ink_drop_host| here? And can you clarify what "might be attached
to" means here? Reading the API documentation here I'd want to know exactly what
happens when I call this function and not have to look for documentation
elsewhere.

[bruthig, 2015/09/15 19:47:09]

Attempted to improve documentation. What do you think?

   static scoped_ptr<InkDropAnimationController>
   CreateInkDropAnimationController(InkDropHost* ink_drop_host);