Enable optimization when compiling for NaCl with GN

BUILD.gn

 # Copyright 2014 The LibYuv Project Authors. All rights reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS. All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/arm.gni")
 import("//build/config/sanitizers/sanitizers.gni")
@@ skipping 84 matching lines @@
     defines += [ "LIBYUV_DISABLE_X86" ]
   }
 
   deps = [
     "//third_party:jpeg",
   ]
 
   if (use_neon) {
     deps += [ ":libyuv_neon" ]
   }
+
+  if (is_nacl) {
+    # Always enable optimization under NaCl to workaround crbug.com/538243 .
+    configs -= [ "//build/config/compiler:default_optimization" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+  }
 }
 
 if (use_neon) {
   static_library("libyuv_neon") {
     sources = [
       "source/compare_neon.cc",
       "source/compare_neon64.cc",
       "source/rotate_neon.cc",
       "source/rotate_neon64.cc",
       "source/row_neon.cc",
       "source/row_neon64.cc",
       "source/scale_neon.cc",
       "source/scale_neon64.cc",
     ]
 
     public_configs = [ ":libyuv_config" ]
 
     configs -= [ "//build/config/compiler:compiler_arm_fpu" ]
     cflags = [ "-mfpu=neon" ]
   }
 }