format GN files, and invert if->config to config->if

BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("gn/shared_sources.gni")
 
 declare_args() {
   skia_enable_tools = !is_fuchsia && !is_component_build
 
@@ skipping 463 matching lines @@
       "src/ports/SkFontMgr_win_dw.cpp",
       "src/ports/SkFontMgr_win_dw_factory.cpp",
       "src/ports/SkImageEncoder_WIC.cpp",
       "src/ports/SkImageGeneratorWIC.cpp",
       "src/ports/SkOSFile_win.cpp",
       "src/ports/SkScalerContext_win_dw.cpp",
       "src/ports/SkTLS_win.cpp",
       "src/ports/SkTypeface_win_dw.cpp",
       "src/xps/SkDocument_XPS.cpp",
     ]
-    sources -= [ get_path_info("src/utils/SkThreadUtils_pthread.cpp", "abspath") ]
+    sources -=
+        [ get_path_info("src/utils/SkThreadUtils_pthread.cpp", "abspath") ]
   } else {
     sources += [
       "src/ports/SkOSFile_posix.cpp",
       "src/ports/SkTLS_pthread.cpp",
       "src/xps/SkDocument_XPS_None.cpp",
     ]
   }
 
   if (is_android) {
     deps += [
@@ skipping 373 matching lines @@
       "tools/get_images_from_skps.cpp",
     ]
     deps = [
       ":flags",
       ":skia",
       "//third_party/jsoncpp",
     ]
     testonly = true
   }
 }