[ios] Adds configuration helper files for voice search.

ios/chrome/browser/ui/voice/speech_input_locale_match_config.mm

+// 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.
+
+#import "ios/chrome/browser/ui/voice/speech_input_locale_match_config.h"
+
+#import "base/mac/scoped_nsobject.h"
+
+namespace {
+
+// Name of plist file containing locale matches.
+NSString* const kLocaleMatchesFilename = @"SpeechInputLocaleMatches.plist";
+
+// Keys used in SpeechInputLocaleMatches.plist:
+NSString* const kMatchedLocaleKey = @"Locale";
+NSString* const kMatchingLocalesKey = @"MatchingLocales";
+NSString* const kMatchingLanguagesKey = @"MatchingLanguages";
+}

[sdefresne, 2016/10/17 16:12:40]

nit: blank line before closing the namespace and then // namespace comment

[rohitrao (ping after 24h), 2016/10/17 17:42:27]

Done.

+
+#pragma mark - SpeechInputLocaleMatchConfig
+
+@interface SpeechInputLocaleMatchConfig () {
+  // Backing object for the property of the same name.
+  base::scoped_nsobject<NSArray> _matches;
+}
+
+@end
+
+@implementation SpeechInputLocaleMatchConfig
+
++ (instancetype)sharedInstance {
+  static SpeechInputLocaleMatchConfig* matchConfig;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    matchConfig = [[SpeechInputLocaleMatchConfig alloc] init];
+  });
+  return matchConfig;
+}
+
+- (instancetype)init {
+  self = [super initWithAppId:nil version:nil plist:kLocaleMatchesFilename];
+  if (self)
+    self.stopsUpdateChecksOnAppTermination = YES;
+  return self;
+}
+
+#pragma mark Accessors
+
+- (NSArray*)matches {
+  if (!_matches) {
+    NSMutableArray* matches = [NSMutableArray array];
+    for (NSDictionary* matchDict in [self arrayFromConfig]) {
+      SpeechInputLocaleMatch* match = [[[SpeechInputLocaleMatch alloc]
+          initWithDictionary:matchDict] autorelease];
+      [matches addObject:match];
+    }
+    _matches.reset([[NSArray alloc] initWithArray:matches]);

[sdefresne, 2016/10/17 16:12:40]

nit: would be better to use -copy here

  _matches.reset([matches copy]);

[rohitrao (ping after 24h), 2016/10/17 17:42:27]

Done.

+  }
+  return _matches;
+}
+
+#pragma mark UpdatableConfigBase
+
+- (void)resourceDidUpdate:(NSNotification*)notification {
+  [super resourceDidUpdate:notification];
+  _matches.reset();
+}
+
+@end
+
+#pragma mark - SpeechInputLocaleMatch
+
+@interface SpeechInputLocaleMatch () {
+  // Backing objects for properties of the same name.
+  base::scoped_nsobject<NSString> _matchedLocaleCode;
+  base::scoped_nsobject<NSArray> _matchingLocaleCodes;
+  base::scoped_nsobject<NSArray> _matchingLanguages;
+}
+
+@end
+
+@implementation SpeechInputLocaleMatch
+
+- (instancetype)initWithDictionary:(NSDictionary*)matchDict {
+  if ((self = [super init])) {
+    _matchedLocaleCode.reset([matchDict[kMatchedLocaleKey] copy]);
+    _matchingLocaleCodes.reset([matchDict[kMatchingLocalesKey] copy]);
+    _matchingLanguages.reset([matchDict[kMatchingLanguagesKey] copy]);
+  }
+  return self;
+}
+
+#pragma mark Accessors
+
+- (NSString*)matchedLocaleCode {
+  return _matchedLocaleCode;
+}
+
+- (NSArray*)matchingLocaleCodes {
+  return _matchingLocaleCodes;
+}
+
+- (NSArray*)matchingLanguages {
+  return _matchingLanguages;
+}
+
+@end