Introduce FakeChromeIdentity and FakeChromeIdentityService.

ios/public/provider/chrome/browser/signin/fake_chrome_identity_service.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/public/provider/chrome/browser/signin/fake_chrome_identity_service.h"
+
+#import <Foundation/Foundation.h>
+
+#include "base/strings/sys_string_conversions.h"
+#include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
+#import "ios/public/provider/chrome/browser/signin/fake_chrome_identity.h"
+
+namespace ios {
+
+NSString* const kIdentityEmailFormat = @"%@@foo.com";
+NSString* const kIdentityGaiaIDFormat = @"%@ID";
+
+FakeChromeIdentityService::FakeChromeIdentityService()
+    : identities_([[NSMutableArray alloc] init]) {}
+
+FakeChromeIdentityService::~FakeChromeIdentityService() {}
+
+// static
+FakeChromeIdentityService*
+FakeChromeIdentityService::GetInstanceFromChromeProvider() {
+  return static_cast<ios::FakeChromeIdentityService*>(
+      ios::GetChromeBrowserProvider()->GetChromeIdentityService());
+}
+
+bool FakeChromeIdentityService::IsValidIdentity(
+    ChromeIdentity* identity) const {
+  return [identities_ indexOfObject:identity] != NSNotFound;
+}
+
+ChromeIdentity* FakeChromeIdentityService::GetIdentityWithGaiaID(
+    const std::string& gaia_id) const {
+  NSString* gaiaID = base::SysUTF8ToNSString(gaia_id);
+  NSUInteger index =
+      [identities_ indexOfObjectPassingTest:^BOOL(ChromeIdentity* obj,
+                                                  NSUInteger, BOOL* stop) {
+        return [[obj gaiaID] isEqualToString:gaiaID];
+      }];
+  if (index == NSNotFound) {
+    return nil;
+  }
+  return [identities_ objectAtIndex:index];
+}
+
+bool FakeChromeIdentityService::HasIdentities() const {
+  return [identities_ count] > 0;
+}
+
+NSArray* FakeChromeIdentityService::GetAllIdentities() const {
+  return identities_;
+}
+
+NSArray* FakeChromeIdentityService::GetAllIdentitiesSortedForDisplay() const {
+  return identities_;
+}
+
+void FakeChromeIdentityService::ForgetIdentity(
+    ChromeIdentity* identity,
+    ForgetIdentityCallback callback) {
+  [identities_ removeObject:identity];
+  FireIdentityListChanged();
+  if (callback) {
+    // Forgetting an identity is normally an asynchronous operation (that
+    // require some network calls), this is replicated here by dispatching it.
+    dispatch_async(dispatch_get_main_queue(), ^{
+      callback(nil);
+    });
+  }
+}
+
+void FakeChromeIdentityService::AddIdentities(NSArray* identitiesNames) {
+  for (NSString* name in identitiesNames) {
+    NSString* email = [NSString stringWithFormat:kIdentityEmailFormat, name];
+    NSString* gaiaID = [NSString stringWithFormat:kIdentityGaiaIDFormat, name];
+    [identities_ addObject:[FakeChromeIdentity identityWithEmail:email
+                                                          gaiaID:gaiaID
+                                                            name:name]];
+  }
+}
+
+void FakeChromeIdentityService::AddIdentity(ChromeIdentity* identity) {
+  [identities_ addObject:identity];
+  FireIdentityListChanged();
+}
+
+}  // namespace ios