Reland of Force U.S. English keyboard layout for TextfieldTest.KeysWithModifiersTest

ui/events/test/keyboard_layout_mac.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/events/test/keyboard_layout.h"
+
+#include "base/logging.h"
+
+namespace ui {
+
+PlatformKeyboardLayout GetPlatformKeyboardLayout(KeyboardLayout layout) {
+  // Right now tests only need US English.  If other layouts need to be
+  // supported in the future this code should be extended.
+  DCHECK_EQ(KEYBOARD_LAYOUT_ENGLISH_US, layout);
+
+  const char kUsInputSourceId[] = "com.apple.keylayout.US";
+
+  base::ScopedCFTypeRef<CFMutableDictionaryRef> input_source_list_filter(
+      CFDictionaryCreateMutable(kCFAllocatorDefault, 1,
+                                &kCFTypeDictionaryKeyCallBacks,
+                                &kCFTypeDictionaryValueCallBacks));
+  base::ScopedCFTypeRef<CFStringRef> input_source_id_ref(
+      CFStringCreateWithCString(kCFAllocatorDefault, kUsInputSourceId,
+                                kCFStringEncodingUTF8));
+  CFDictionaryAddValue(input_source_list_filter, kTISPropertyInputSourceID,
+                       input_source_id_ref);
+  base::ScopedCFTypeRef<CFArrayRef> input_source_list(
+      TISCreateInputSourceList(input_source_list_filter, true));
+  if (CFArrayGetCount(input_source_list) != 1)
+    return PlatformKeyboardLayout();
+
+  return PlatformKeyboardLayout(
+      (TISInputSourceRef)CFArrayGetValueAtIndex(input_source_list, 0),
+      base::scoped_policy::RETAIN);

[Wez, 2016/09/21 16:28:19]

nit: Woah, weird; it might be easier-to-read to use the ScopedCFTypeRef here
rather than the PlatformKeyboardLayout typedef.

[Tomasz Moniuszko, 2016/09/23 13:00:48]

Done.

+}
+
+PlatformKeyboardLayout ScopedKeyboardLayout::GetActiveLayout() {
+  return PlatformKeyboardLayout(TISCopyCurrentKeyboardInputSource());
+}
+
+void ScopedKeyboardLayout::ActivateLayout(PlatformKeyboardLayout layout) {
+  DCHECK(layout);
+  OSStatus result = TISSelectInputSource(layout);
+  DCHECK_EQ(noErr, result);
+}
+
+}  // namespace ui