Moves common view_manager related aura files to mojo/aura

mojo/aura/window_tree_host_mojo.h

Index: mojo/aura/window_tree_host_mojo.h
diff --git a/mojo/examples/aura_demo/window_tree_host_view_manager.h b/mojo/aura/window_tree_host_mojo.h
similarity index 69%
rename from mojo/examples/aura_demo/window_tree_host_view_manager.h
rename to mojo/aura/window_tree_host_mojo.h
index f22cdb61c89e7dc85678df7397492b972b997b61..fe5ca77544d85e4aa1d26712fe41049979ef32b4 100644
--- a/mojo/examples/aura_demo/window_tree_host_view_manager.h
+++ b/mojo/aura/window_tree_host_mojo.h
@@ -9,17 +9,31 @@
 #include "ui/events/event_source.h"
 #include "ui/gfx/geometry/rect.h"
 
+class SkBitmap;
+
+namespace ui {
+class Compositor;
+}
+
 namespace mojo {
-namespace examples {
 
-class WindowTreeHostViewManager : public aura::WindowTreeHost,
-                                  public ui::EventSource {
+class WindowTreeHostMojoDelegate;
+
+class WindowTreeHostMojo : public aura::WindowTreeHost, public ui::EventSource {
  public:
-  explicit WindowTreeHostViewManager(const gfx::Rect& bounds);
-  virtual ~WindowTreeHostViewManager();
+  WindowTreeHostMojo(const gfx::Rect& bounds,
+                     WindowTreeHostMojoDelegate* delegate);
+  virtual ~WindowTreeHostMojo();
+
+  // Returns the WindowTreeHostMojo for the specified compositor.
+  static WindowTreeHostMojo* ForCompositor(ui::Compositor* compositor);
 
   const gfx::Rect& bounds() const { return bounds_; }
 
+  // Sets the contents to show in this WindowTreeHost. This forwards to the
+  // delegate.
+  void SetContents(const SkBitmap& contents);
+
  private:
   // WindowTreeHost:
   virtual ui::EventSource* GetEventSource() OVERRIDE;
@@ -42,10 +56,11 @@ class WindowTreeHostViewManager : public aura::WindowTreeHost,
 
   gfx::Rect bounds_;
 
-  DISALLOW_COPY_AND_ASSIGN(WindowTreeHostViewManager);
+  WindowTreeHostMojoDelegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowTreeHostMojo);
 };
 
-}  // namespace examples
 }  // namespace mojo
 
 #endif  // MOJO_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_H_