Introdcue AshWindowTreeHost and move ash/chrome specific code in WTH to ash.

ui/aura/window_unittest.cc

Index: ui/aura/window_unittest.cc
diff --git a/ui/aura/window_unittest.cc b/ui/aura/window_unittest.cc
index 986929b0b1bfb94f9103a4279ff5e30063144251..be2257c253decefb90e96a10ac1c01525e7300e3 100644
--- a/ui/aura/window_unittest.cc
+++ b/ui/aura/window_unittest.cc
@@ -370,7 +370,7 @@ TEST_F(WindowTest, MoveCursorToWithTransformRootWindow) {
   transform.Translate(100.0, 100.0);
   transform.Rotate(90.0);
   transform.Scale(2.0, 5.0);
-  host()->SetTransform(transform);
+  host()->SetRootTransform(transform);
   host()->MoveCursorTo(gfx::Point(10, 10));
 #if !defined(OS_WIN)
   gfx::Point mouse_location;
@@ -451,7 +451,7 @@ TEST_F(WindowTest, MoveCursorToWithComplexTransform) {
   transform.Translate(10.0, 20.0);
   transform.Rotate(10.0);
   transform.Scale(0.3f, 0.5f);
-  host()->SetTransform(root_transform);
+  host()->SetRootTransform(root_transform);
   w1->SetTransform(transform);
   w11->SetTransform(transform);
   w111->SetTransform(transform);
@@ -1494,7 +1494,7 @@ TEST_F(WindowTest, Transform) {
   gfx::Transform transform;
   transform.Translate(size.height(), 0);
   transform.Rotate(90.0);
-  host()->SetTransform(transform);
+  host()->SetRootTransform(transform);
 
   // The size should be the transformed size.
   gfx::Size transformed_size(size.height(), size.width());
@@ -1521,7 +1521,7 @@ TEST_F(WindowTest, TransformGesture) {
   gfx::Transform transform;
   transform.Translate(size.height(), 0.0);
   transform.Rotate(90.0);
-  host()->SetTransform(transform);
+  host()->SetRootTransform(transform);
 
   ui::TouchEvent press(
       ui::ET_TOUCH_PRESSED, gfx::Point(size.height() - 10, 10), 0, getTime());