Add ppapi, improve Windows GN build.

ui/base/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 233 matching lines @@
     "win/scoped_ole_initializer.h",
     "win/shell.cc",
     "win/shell.h",
     "win/touch_input.cc",
     "win/touch_input.h",
     "win/window_event_target.cc",
     "win/window_event_target.h",
     "window_open_disposition.cc",
     "window_open_disposition.h",
     "work_area_watcher_observer.h",
-    "x/selection_owner.cc",
-    "x/selection_owner.h",
-    "x/selection_requestor.cc",
-    "x/selection_requestor.h",
-    "x/selection_utils.cc",
-    "x/selection_utils.h",
     "x/x11_menu_list.cc",
     "x/x11_menu_list.h",
     "x/x11_util.cc",
     "x/x11_util.h",
     "x/x11_util_internal.h",
   ]
 
   defines = [ "UI_BASE_IMPLEMENTATION" ]
 
   deps = [
@@ skipping 17 matching lines @@
       "l10n/l10n_util_mac.mm",
     ]
   }
 
   if (toolkit_views) {
     deps += [
       "//ui/events",
     ]
   }
 
+  if (use_x11 && use_aura) {
+    sources += [
+      "x/selection_owner.cc",
+      "x/selection_owner.h",
+      "x/selection_requestor.cc",
+      "x/selection_requestor.h",
+      "x/selection_utils.cc",
+      "x/selection_utils.h",
+    ]
+  }
+
   if (use_aura) {
     deps += [
       "//ui/events",
     ]
   } else {
     sources -= [
       "cursor/cursor.cc",
       "cursor/cursor.h",
       "dragdrop/drag_utils_aura.cc",
-      "x/selection_owner.cc",
-      "x/selection_owner.h",
-      "x/selection_requestor.cc",
-      "x/selection_requestor.h",
-      "x/selection_utils.cc",
-      "x/selection_utils.h",
     ]
   }
   if (!use_x11) {
     sources -= [
       "x/x11_util.cc",
       "x/x11_util.h",
       "x/x11_util_internal.h",
     ]
   }
 
+  if (!use_ozone) {
+    sources -= [
+      "touch/touch_device_ozone.cc",
+    ]
+  }
+
   if (!use_aura || !is_linux) {
     sources -= [
       "resource/resource_bundle_auralinux.cc",
     ]
   }
 
   if (use_aura && is_win) {
     sources -= [
       "dragdrop/drag_utils_aura.cc",
     ]
@@ skipping 215 matching lines @@
       "../android/java/src/org/chromium/ui/base/DeviceFormFactor.java",
       "../android/java/src/org/chromium/ui/base/LocalizationUtils.java",
       "../android/java/src/org/chromium/ui/base/SelectFileDialog.java",
       "../android/java/src/org/chromium/ui/base/TouchDevice.java",
       "../android/java/src/org/chromium/ui/base/ViewAndroid.java",
       "../android/java/src/org/chromium/ui/base/WindowAndroid.java",
     ]
     jni_package = "base"
   }
 }