Move fxge/android to if(is_android) on build

BUILD.gn

 # Copyright 2016 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_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_common_config") {
   cflags = []
@@ skipping 728 matching lines @@
       "core/fxcrt/fx_arabic.cpp",
       "core/fxcrt/fx_arabic.h",
       "core/fxcrt/fx_arb.h",
       "core/fxcrt/fx_basic_maps.cpp",
     ]
   }
 }
 
 static_library("fxge") {
   sources = [
-    "core/fxge/android/fpf_skiafont.cpp",
-    "core/fxge/android/fpf_skiafont.h",
-    "core/fxge/android/fpf_skiafontmgr.cpp",
-    "core/fxge/android/fpf_skiafontmgr.h",
-    "core/fxge/android/fpf_skiamodule.cpp",
-    "core/fxge/android/fpf_skiamodule.h",
-    "core/fxge/android/fx_android_font.cpp",
-    "core/fxge/android/fx_android_font.h",
-    "core/fxge/android/fx_android_imp.cpp",
     "core/fxge/apple/apple_int.h",
     "core/fxge/apple/cfx_quartzdevice.h",
     "core/fxge/apple/fx_mac_imp.cpp",
     "core/fxge/apple/fx_quartz_device.cpp",
     "core/fxge/cfx_facecache.h",
     "core/fxge/cfx_fontcache.h",
     "core/fxge/cfx_fontmapper.h",
     "core/fxge/cfx_fontmgr.h",
     "core/fxge/cfx_fxgedevice.h",
     "core/fxge/cfx_gemodule.h",
@@ skipping 92 matching lines @@
       "core/fxge/win32/dwrite_int.h",
       "core/fxge/win32/fx_win32_device.cpp",
       "core/fxge/win32/fx_win32_dib.cpp",
       "core/fxge/win32/fx_win32_dwrite.cpp",
       "core/fxge/win32/fx_win32_gdipext.cpp",
       "core/fxge/win32/fx_win32_print.cpp",
       "core/fxge/win32/win32_int.h",
     ]
     configs -= [ "//build/config/win:lean_and_mean" ]
   }
+
+  if (is_android) {

[Lei Zhang, 2016/10/14 19:46:05]

I don't think this is necessary. I believe some default GN rules for directory
names already cover this. i.e. Without this CL, do you see any build artifacts
for these files in your out/ directory?

[npm, 2016/10/17 15:02:25]

I do not

+    sources += [
+      "core/fxge/android/fpf_skiafont.cpp",
+      "core/fxge/android/fpf_skiafont.h",
+      "core/fxge/android/fpf_skiafontmgr.cpp",
+      "core/fxge/android/fpf_skiafontmgr.h",
+      "core/fxge/android/fpf_skiamodule.cpp",
+      "core/fxge/android/fpf_skiamodule.h",
+      "core/fxge/android/fx_android_font.cpp",
+      "core/fxge/android/fx_android_font.h",
+      "core/fxge/android/fx_android_imp.cpp",
+    ]
+  }
 }
 
 static_library("fxedit") {
   sources = [
     "fpdfsdk/fxedit/fx_edit.h",
     "fpdfsdk/fxedit/fxet_ap.cpp",
     "fpdfsdk/fxedit/fxet_edit.cpp",
     "fpdfsdk/fxedit/fxet_edit.h",
     "fpdfsdk/fxedit/fxet_list.cpp",
     "fpdfsdk/fxedit/fxet_list.h",
@@ skipping 877 matching lines @@
 }
 
 if (pdf_is_standalone) {
   source_set("samples") {
     testonly = true
     deps = [
       "//samples",
     ]
   }
 }