Make absolute and sort all Sky headers

sky/engine/core/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("//sky/engine/bindings/scripts/scripts.gni")
 import("//sky/engine/build/scripts/scripts.gni")
 import("//sky/engine/core/core.gni")
 
 visibility = ["//sky/engine/*"]
 
@@ skipping 46 matching lines @@
   ]
 }
 
 static_library("core") {
   output_name = "sky_core"
 
   deps = [
     ":core_generated",
     ":libraries",
     ":prerequisites",
+    "//sky/engine/platform",
   ]
 
   sources = sky_core_files
 
   forward_dependent_configs_from = [
     ":libraries",
   ]
 }
 
 source_set("testing") {
   deps = [
     ":core",
     ":core_generated",
     ":prerequisites",
+    "//sky/engine/platform",
+    "//sky/engine/wtf",
   ]
 
   sources = [
     "testing/DummyPageHolder.cpp",
     "testing/DummyPageHolder.h",
     "testing/NullExecutionContext.cpp",
     "testing/NullExecutionContext.h",
     "testing/URLTestHelpers.cpp",
     "testing/URLTestHelpers.h",
   ]
@@ skipping 386 matching lines @@
     "$sky_core_output_dir/{{source_name_part}}.h",
   ]
   args = [
     "{{source}}",
     rel_sky_core_gen_dir,
     bison_exe,
   ]
 
   deps = make_core_generated_deps
 }