Redefine is_linux to not include Android in the GN build.

tools/gn/secondary/skia/BUILD.gn

 # Copyright (c) 2013 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.
 
 enable_printing = true  # TODO(brettw) pass this feature flag in somehow.
 skia_support_gpu = !is_ios
 skia_support_pdf = !is_ios && enable_printing
 
 # External-facing config for dependent code.
 config("skia_config") {
@@ skipping 1220 matching lines @@
       ]
     }
 
     if (skia_support_pdf) {
       deps += [ "//third_party/sfntly" ]
     }
   }
 }
 
 
-if (is_linux && !is_android) {
-    # TODO(brettw) && arch != "arm" && arch != "mipsel"
+if (is_linux && (cpu_arch == "x86" || cpu_arch == "x64")) {
   sse_cflags = [ "-msse2" ]
 } else {
   sse_cflags = []
 }
 
 
 static_library("skia_chrome_opts") {
   sources = [
     "ext/convolver_SSE2.cc",
   ]
@@ skipping 48 matching lines @@
     ":skia_config",
     "//build/config/compiler:no_chromium_code"
   ]
 
   if (is_linux) {
     cflags = [ "-msse3" ]
   } else if (is_mac) {
     cflags = [ "-mssse3" ] # Note the third 's'.
   }
 }