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

ash/ash.gyp

Index: ash/ash.gyp
diff --git a/ash/ash.gyp b/ash/ash.gyp
index 0d62c8751c5fc282171d7c20d2498943788a2b7e..43eadd4e8bc3590de849b017d2633fd2510e6ee9 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -184,8 +184,8 @@
         'frame/frame_border_hit_test_controller.h',
         'frame/default_header_painter.cc',
         'frame/default_header_painter.h',
-	    'frame/frame_util.cc',
-	    'frame/frame_util.h',
+        'frame/frame_util.cc',
+        'frame/frame_util.h',
         'frame/header_painter.h',
         'frame/header_painter_util.cc',
         'frame/header_painter_util.h',
@@ -194,9 +194,16 @@
         'gpu_support_stub.h',
         'high_contrast/high_contrast_controller.cc',
         'high_contrast/high_contrast_controller.h',
-        'host/window_tree_host_factory.cc',
-        'host/window_tree_host_factory.h',
-        'host/window_tree_host_factory_win.cc',
+        'host/ash_remote_window_tree_host_win.cc',
+        'host/ash_remote_window_tree_host_win.h',
+        'host/ash_window_tree_host.h',
+        'host/ash_window_tree_host_ozone.cc',
+        'host/ash_window_tree_host_win.cc',
+        'host/ash_window_tree_host_x11.cc',
+        'host/ash_window_tree_host_x11.h',
+        'host/root_window_transformer.h',
+        'host/transformer_helper.cc',
+        'host/transformer_helper.h',
         'ime/candidate_view.cc',
         'ime/candidate_view.h',
         'ime/candidate_window_view.cc',
@@ -684,6 +691,10 @@
             ['exclude', 'accelerators/spoken_feedback_toggler.cc'],
             ['exclude', 'accelerators/spoken_feedback_toggler.h'],
           ],
+        }, { # else: use_x11==1
+          'dependencies': [
+            '../build/linux/system.gyp:xfixes',
+           ],
         }],
         ['chromeos==1', {
           'dependencies': [
@@ -897,6 +908,7 @@
         'frame/caption_buttons/frame_maximize_button_unittest.cc',
         'frame/custom_frame_view_ash_unittest.cc',
         'frame/default_header_painter_unittest.cc',
+        'host/ash_window_tree_host_x11_unittest.cc',
         'ime/candidate_window_view_unittest.cc',
         'ime/input_method_menu_item_unittest.cc',
         'ime/input_method_menu_manager_unittest.cc',