Move most of FontRenderStyle manipulation code into its own file

third_party/WebKit/Source/platform/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("//testing/test.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/platform/platform.gni")
 import("//third_party/WebKit/Source/platform/platform_generated.gni")
@@ skipping 403 matching lines @@
       "clipboard/ClipboardUtilitiesWin.cpp",
       "text/LocaleWin.cpp",
     ]
   }
 
   if (is_android) {
     # Add in some Linux files also shared with Android.
     set_sources_assignment_filter([])
     sources += [
       "fonts/linux/FontPlatformDataLinux.cpp",
+      "fonts/linux/FontRenderStyle.cpp",
       "fonts/linux/FontRenderStyle.h",
     ]
     set_sources_assignment_filter(sources_assignment_filter)
   } else {
     sources -= [ "scroll/ScrollbarThemeAndroid.cpp" ]
   }
 
   if (!use_default_render_theme) {
     sources -= [
       "scroll/ScrollbarThemeAura.cpp",
@@ skipping 177 matching lines @@
 }
 
 if (current_cpu == "x86" || current_cpu == "x64") {
   source_set("blink_x86_sse") {
     sources = blink_platform_sse_files
     deps = [
       ":blink_common",
     ]
   }
 }