Move fxge/android to if(is_android) on build

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index f87201cc57ed62e03d770543b1158f96c8e26934..e6fcb55497aa96757e54ec4a6d0ffda2d346b69d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -746,15 +746,6 @@ static_library("fxcrt") {
 
 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",
@@ -867,6 +858,20 @@ static_library("fxge") {
     ]
     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") {