Implement Blink's Platform::isValidLocaleSyntax() API in Chromium.

content/child/blink_platform_impl.cc

Index: content/child/blink_platform_impl.cc
diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index 25faab4b5b5a80c78133361e56a334c2725175dd..ec87cf8dd5684979d09c1f9d74896dcc0b07bc72 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -59,6 +59,7 @@
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "third_party/WebKit/public/platform/WebWaitableEvent.h"
 #include "third_party/WebKit/public/web/WebSecurityOrigin.h"
+#include "ui/base/l10n/l10n_util.h"
 #include "ui/base/layout.h"
 #include "ui/events/gestures/blink/web_gesture_curve_impl.h"
 #include "ui/events/keycodes/dom4/keycode_converter.h"
@@ -1093,6 +1094,10 @@ void BlinkPlatformImpl::stopSharedTimer() {
   shared_timer_.Stop();
 }
 
+bool BlinkPlatformImpl::isValidLocaleSyntax(const blink::WebString& locale) {
+  return l10n_util::IsValidLocaleSyntax(locale.utf8().data());
+}
+
 void BlinkPlatformImpl::callOnMainThread(
     void (*func)(void*), void* context) {
   main_thread_task_runner_->PostTask(FROM_HERE, base::Bind(func, context));