Implements computation of touch calibration transform using user provided data

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 2e93167204d9f1b94b6d1ebb4e6854205f7979a7..a97815b6626071824cdd7554fa93ecd78491b819 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -1400,10 +1400,11 @@ test("ash_unittests") {
   ]
 
   if (!use_x11) {
-    sources -= [
-      "host/ash_window_tree_host_x11_unittest.cc",
-      "touch/touch_transformer_controller_unittest.cc",
-    ]
+    sources -= [ "host/ash_window_tree_host_x11_unittest.cc" ]
+  }
+
+  if (!use_x11 && !use_ozone) {

[kylechar, 2016/12/22 16:56:00]

The top of this file has an assert(is_chromeos) so one of these two args have to
be true now. I think you can remove this entirely.

[malaykeshav, 2016/12/22 19:48:50]

Done

+    sources -= [ "touch/touch_transformer_controller_unittest.cc" ]
   }
 
   # Usage of content should be in ash_with_content.