ozone: Use allow_circular_includes_from to fix deps issue

ui/ozone/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")
 import("//ui/ozone/ozone.gni")
 import("//testing/test.gni")
 
 assert(use_ozone)
 
@@ skipping 125 matching lines @@
     "public/ozone_platform.h",
     constructor_list_cc_file,
     platform_list_cc_file,
     platform_list_h_file,
   ]
 
   defines = [ "OZONE_IMPLEMENTATION" ]
 
   public_deps = [
     ":ozone_base",
+    "//base",
+    "//ipc",
+    "//skia",
+    "//ui/display/types",
+    "//ui/events",
+    "//ui/events/devices",
+    "//ui/gfx",
+    "//ui/gfx/geometry",
+    "//ui/platform_window",
   ]
 
-  deps =
-      [
-        ":generate_constructor_list",
-        ":generate_ozone_platform_list",
-        "//base",
-        "//ipc",
-        "//skia",
-        "//ui/display/types",
-        "//ui/display/util",
-        "//ui/events",
-        "//ui/events/devices",
-        "//ui/events/ozone:events_ozone",
-        "//ui/gfx",
-        "//ui/gfx/geometry",
-        "//ui/gfx/ipc",
-        "//ui/platform_window",
+  deps = [
+    ":generate_constructor_list",
+    ":generate_ozone_platform_list",
+  ]
 
-        # TODO(GYP) the GYP version has a way to add additional dependencies via
-        # build flags.
-      ] + ozone_platform_deps
+  # TODO(GYP) the GYP version has a way to add additional dependencies via

[rjkroege, 2016/02/19 19:00:53]

So, can we add additional platforms from an external tree and still build with
GN?

[spang, 2016/02/22 19:27:13]

Might be possible to do it via gn args. Nobody has looked into it really.

+  # build flags.
+  public_deps += ozone_platform_deps
+
+  # Platforms are always linked into //ui/ozone and can include our headers.
+  allow_circular_includes_from = ozone_platform_deps
 }
 
 # GYP version: ui/ozone/ozone.gyp:generate_ozone_platform_list
 action("generate_ozone_platform_list") {
   script = "generate_ozone_platform_list.py"
   outputs = [
     platform_list_cc_file,
     platform_list_h_file,
     platform_list_txt_file,
   ]
@@ skipping 37 matching lines @@
   sources = [
     "run_all_unittests.cc",
   ]
 
   deps = [
            "//base/test:test_support",
            "//testing/gtest",
            "//ui/gfx/geometry",
          ] + ozone_platform_test_deps
 }