Adds constants and runner for animations

services/view_manager/server_view.h

Index: services/view_manager/server_view.h
diff --git a/services/view_manager/server_view.h b/services/view_manager/server_view.h
index afce3d3a4e75e213a6d2736823c9d730a9d5a428..24a64961d71df10c94c50b208bd6b6f597db25bd 100644
--- a/services/view_manager/server_view.h
+++ b/services/view_manager/server_view.h
@@ -12,6 +12,7 @@
 #include "mojo/services/public/interfaces/view_manager/view_manager.mojom.h"
 #include "services/view_manager/ids.h"
 #include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/transform.h"
 
 namespace mojo {
 namespace service {
@@ -63,6 +64,9 @@ class ServerView {
   float opacity() const { return opacity_; }
   void SetOpacity(float value);
 
+  const gfx::Transform& transform() const { return transform_; }
+  void SetTransform(const gfx::Transform& transform);

[Elliot Glaysher, 2014/12/03 23:49:59]

If ServerView's have arbitrary transforms now, do these need to be pumped to the
View? (How do arbitrary transform animations effect input event processing?)

[sky, 2014/12/04 00:21:23]

The client lib will definitely want transform too. I have to think about whether
it makes sense to send animation values back to the client.
We have to resolve what the right way is to handle input events. The surface
service knows where all the surfaces are and can do hit testing. That isn't how
we're doing things now though.

+
   const std::map<std::string, std::vector<uint8_t>>& properties() const {
     return properties_;
   }
@@ -73,7 +77,7 @@ class ServerView {
   bool IsDrawn(const ServerView* root) const;
 
   void SetSurfaceId(cc::SurfaceId surface_id);
-  const cc::SurfaceId surface_id() const { return surface_id_; }
+  const cc::SurfaceId& surface_id() const { return surface_id_; }
 
 #if !defined(NDEBUG)
   std::string GetDebugWindowHierarchy() const;
@@ -94,6 +98,7 @@ class ServerView {
   gfx::Rect bounds_;
   cc::SurfaceId surface_id_;
   float opacity_;
+  gfx::Transform transform_;
 
   std::map<std::string, std::vector<uint8_t>> properties_;