Fix BUILD.gn for arch other then x86 and x64

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 1f43ca1c5892f0246750d64f8f8de0d62d922165..2ad2aab5c948116f44a612827d5e24f0da2e39d2 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -117,14 +117,17 @@ gpu_gypi = exec_script("gn/gypi_to_gn.py",
                        "scope",
                        [ "gyp/gpu.gypi" ])
 
-opts_gypi = exec_script("gn/gypi_to_gn.py",
-                        [
-                          rebase_path("gyp/opts.gypi"),
-                          "--replace=<(skia_include_path)=include",
-                          "--replace=<(skia_src_path)=src",
-                        ],
-                        "scope",
-                        [ "gyp/opts.gypi" ])
+is_x86 = current_cpu == "x64" || current_cpu == "x86"
+if (is_x86) {
+  opts_gypi = exec_script("gn/gypi_to_gn.py",
+                          [
+                            rebase_path("gyp/opts.gypi"),
+                            "--replace=<(skia_include_path)=include",
+                            "--replace=<(skia_src_path)=src",
+                          ],
+                          "scope",
+                          [ "gyp/opts.gypi" ])
+}
 
 pdf_gypi = exec_script("gn/gypi_to_gn.py",
                        [
@@ -144,8 +147,6 @@ utils_gypi = exec_script("gn/gypi_to_gn.py",
                          "scope",
                          [ "gyp/utils.gypi" ])
 
-is_x86 = current_cpu == "x64" || current_cpu == "x86"
-
 if (is_x86) {

[mtklein, 2016/08/17 12:43:39]

Let's try to fix this differently, by adding opts_none here using
sources=opts_gypi.none_sources and no extra cflags.
Then we should depend on opts_none in an else branch of if (is_x86) { deps +=
... } below.

[anmittal, 2016/08/17 18:11:54]

Done.

   source_set("opts_sse2") {
     configs += skia_library_configs
@@ -530,8 +531,8 @@ test_lib("experimental_svg_model") {
   sources = [
     "experimental/svg/model/SkSVGAttribute.cpp",
     "experimental/svg/model/SkSVGAttributeParser.cpp",
-    "experimental/svg/model/SkSVGContainer.cpp",
     "experimental/svg/model/SkSVGCircle.cpp",
+    "experimental/svg/model/SkSVGContainer.cpp",
     "experimental/svg/model/SkSVGDOM.cpp",
     "experimental/svg/model/SkSVGEllipse.cpp",
     "experimental/svg/model/SkSVGNode.cpp",