Move SourcePosition into separate header file.

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/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 if (is_android) {
@@ skipping 1244 matching lines @@
     "src/signature.h",
     "src/simulator.h",
     "src/small-pointer-list.h",
     "src/snapshot/natives.h",
     "src/snapshot/natives-common.cc",
     "src/snapshot/serialize.cc",
     "src/snapshot/serialize.h",
     "src/snapshot/snapshot-common.cc",
     "src/snapshot/snapshot-source-sink.cc",
     "src/snapshot/snapshot-source-sink.h",
+    "src/source-position.h",
     "src/splay-tree.h",
     "src/splay-tree-inl.h",
     "src/snapshot/snapshot.h",
     "src/startup-data-util.h",
     "src/startup-data-util.cc",
     "src/string-builder.cc",
     "src/string-builder.h",
     "src/string-search.h",
     "src/string-stream.cc",
     "src/string-stream.h",
@@ skipping 623 matching lines @@
     if (!is_component_build) {
       sources += [
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }