fuchsia: define SYSTEM_NATIVE_UTF8

Fixes RTLTest.WrapPathWithLTRFormatting.

Bug: 706592
Change-Id: I36f629ef8cfb512e78b1a060168d9edc412b7056
Reviewed-on: https://chromium-review.googlesource.com/541997Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#481089}

base/BUILD.gn

@@ -1196,7 +1196,7 @@ component("base") {
 
   # Allow more direct string conversions on platforms with native utf8
   # strings
-  if (is_mac || is_ios || is_chromeos || is_chromecast) {
+  if (is_mac || is_ios || is_chromeos || is_chromecast || is_fuchsia) {
     defines += [ "SYSTEM_NATIVE_UTF8" ]
   }
 
@@ -2323,7 +2323,7 @@ test("base_unittests") {
 
   # Allow more direct string conversions on platforms with native utf8
   # strings
-  if (is_mac || is_ios || is_chromeos || is_chromecast) {
+  if (is_mac || is_ios || is_chromeos || is_chromecast || is_fuchsia) {
     defines += [ "SYSTEM_NATIVE_UTF8" ]
   }
 

base/strings/sys_string_conversions_posix.cc

@@ -157,6 +157,6 @@ std::wstring SysNativeMBToWide(const StringPiece& native_mb) {
   return out;
 }
 
-#endif  // OS_CHROMEOS
+#endif  // defined(SYSTEM_NATIVE_UTF8) || defined(OS_ANDROID)
 
 }  // namespace base

testing/buildbot/filters/fuchsia.base_unittests.filter

@@ -162,7 +162,6 @@
 -ProcessUtilTest.LaunchProcess
 -ProcessUtilTest.PreExecHook
 -ProcessUtilTest.SpawnChild
--RTLTest.WrapPathWithLTRFormatting
 -RedirectionToTaskScheduler/SequencedWorkerPoolTest.AvoidsDeadlockOnShutdown/0
 -RedirectionToTaskScheduler/SequencedWorkerPoolTest.AvoidsDeadlockOnShutdownWithSequencedBlockingTasks/0
 -RedirectionToTaskScheduler/SequencedWorkerPoolTest.ContinueOnShutdown/0