[GN] Add support for disabling opts via SK_BUILD_NO_OPTS define.

tests/SkBlend_optsTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <string>
 #include <tuple>
 #include <vector>
@@ skipping 17 matching lines @@
 extern void trivial_srcover_srgb_srgb(
     uint32_t* dst, const uint32_t* const srcStart, int ndst, const int nsrc);
 
 extern void best_non_simd_srcover_srgb_srgb(
     uint32_t* dst, const uint32_t* const srcStart, int ndst, const int nsrc);
 
 extern void srcover_srgb_srgb(
     uint32_t* dst, const uint32_t* const srcStart, int ndst, const int nsrc);
 }
 
-#if defined(SK_CPU_X86) && !defined(SK_BUILD_FOR_IOS)
+#if defined(SK_CPU_X86) && !defined(SK_BUILD_NO_OPTS)
 namespace sk_sse41 {
 extern void srcover_srgb_srgb(
     uint32_t* dst, const uint32_t* const srcStart, int ndst, const int nsrc);
 }
 #endif
 
 static SkString missmatch_message(std::string resourceName, std::string name, int x, int y,
                                   uint32_t src, uint32_t good, uint32_t bad) {
     return SkStringPrintf(
         "%s - %s missmatch at %d, %d src: %08x good: %08x bad: %08x",
@@ skipping 48 matching lines @@
         src += width;
     }
 }
 
 DEF_TEST(SkBlend_optsCheck, reporter) {
     std::vector<Spec> specs = {
         Spec{sk_default::trivial_srcover_srgb_srgb,       "trivial"},
         Spec{sk_default::best_non_simd_srcover_srgb_srgb, "best_non_simd"},
         Spec{sk_default::srcover_srgb_srgb,               "default"},
     };
-    #if defined(SK_CPU_X86) && !defined(SK_BUILD_FOR_IOS)
+    #if defined(SK_CPU_X86) && !defined(SK_BUILD_NO_OPTS)
     if (SkCpu::Supports(SkCpu::SSE41)) {
         specs.push_back(Spec{sk_sse41::srcover_srgb_srgb, "sse41", });
     }
     #endif
 
     std::vector<std::string> testResources = {
         "yellow_rose", "baby_tux", "plane", "mandrill_512", "iconstrip"
     };
 
     for (auto& spec : specs) {
         for (auto& resourceName : testResources) {
             test_blender(spec, resourceName, reporter);
         }
     }
 }
 
 
 
 DEF_TEST(SkBlend_optsSqrtCheck, reporter) {
     for (int c = 0; c < 256; c++) {
         Sk4f i{(float)c};
         Sk4f ii = i * i;
         Sk4f s = ii.sqrt() + 0.5f;
         Sk4f sf = s.floor();
         REPORTER_ASSERT_MESSAGE(
             reporter, i[0] == sf[0], SkStringPrintf("i: %f, s: %f", i[0], sf[0]));
     }
 }