[ios] Adds test provider implementations.

ios/public/provider/chrome/browser/ui/test_infobar_view.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/ui/test_infobar_view.h"
+
+@implementation TestInfoBarView
+@synthesize visibleHeight = _visibleHeight;
+
+- (NSString*)markedLabel {
+  return @"";
+}
+
++ (NSString*)stringAsLink:(NSString*)str tag:(NSUInteger)tag {
+  return str;
+}
+
+- (void)resetDelegate {
+}
+
+- (void)addCloseButtonWithTag:(NSInteger)tag
+                       target:(id)target
+                       action:(SEL)action {
+}
+
+- (void)addLeftIcon:(UIImage*)image {
+}
+
+- (void)addPlaceholderTransparentIcon:(CGSize const&)imageSize {
+}
+
+- (void)addLeftIconWithRoundedCornersAndShadow:(UIImage*)image {
+}
+
+- (void)addLabel:(NSString*)label {
+}
+
+- (void)addLabel:(NSString*)label target:(id)target action:(SEL)action {
+}
+
+- (void)addButton1:(NSString*)title1
+              tag1:(NSInteger)tag1
+           button2:(NSString*)title2
+              tag2:(NSInteger)tag2
+            target:(id)target
+            action:(SEL)action {
+}
+
+- (void)addButton:(NSString*)title
+              tag:(NSInteger)tag
+           target:(id)target
+           action:(SEL)action {
+}
+
+- (void)addSwitchWithLabel:(NSString*)label
+                      isOn:(BOOL)isOn
+                       tag:(NSInteger)tag
+                    target:(id)target
+                    action:(SEL)action {
+}
+
+@end