Suppress -Wswitch for pdfium's fxge target for now.

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("//testing/test.gni")
 
 pdf_use_skia = false
 
 declare_args() {
   # On Android there's no system FreeType. On Windows and Mac, only a few
@@ skipping 487 matching lines @@
     "core/src/fxge/ge/fx_ge_device.cpp",
     "core/src/fxge/ge/fx_ge_font.cpp",
     "core/src/fxge/ge/fx_ge_fontmap.cpp",
     "core/src/fxge/ge/fx_ge_linux.cpp",
     "core/src/fxge/ge/fx_ge_path.cpp",
     "core/src/fxge/ge/fx_ge_ps.cpp",
     "core/src/fxge/ge/fx_ge_text.cpp",
     "core/src/fxge/ge/text_int.h",
   ]
 
+  config("fxge_warnings") {
+    if (is_clang) {
+      cflags = [
+        # http://code.google.com/p/pdfium/issues/detail?id=188
+        "-Wno-switch",
+      ]
+    }
+  }
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":pdfium_config",
     "//build/config/compiler:no_chromium_code",
+    ":fxge_warnings",
   ]
 
   if (pdf_use_skia) {
     sources = [
       "core/src/fxge/skia/fx_skia_blitter_new.cpp",
       "core/src/fxge/skia/fx_skia_device.cpp",
     ]
     include_dirs = [
       "//third_party/skia/include/config",
       "//third_party/skia/include/core",
@@ skipping 253 matching lines @@
     "//v8",
     "//v8/include",
     "."
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":pdfium_config",
     "//build/config/compiler:no_chromium_code",
   ]
 }