Separate UnicodeCache out into an own 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")
 
 # Because standalone V8 builds are not supported, assume this is part of a
 # Chromium build.
@@ skipping 1199 matching lines @@
     "src/types-inl.h",
     "src/types.cc",
     "src/types.h",
     "src/typing.cc",
     "src/typing.h",
     "src/unbound-queue-inl.h",
     "src/unbound-queue.h",
     "src/unicode-inl.h",
     "src/unicode.cc",
     "src/unicode.h",
+    "src/unicode-cache-inl.h",
+    "src/unicode-cache.h",
     "src/unicode-decoder.cc",
     "src/unicode-decoder.h",
     "src/unique.h",
     "src/utils.cc",
     "src/utils.h",
     "src/v8.cc",
     "src/v8.h",
     "src/v8memory.h",
     "src/v8threads.cc",
     "src/v8threads.h",
@@ skipping 585 matching lines @@
     if (!is_component_build) {
       sources += [
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }