Adding hooks to add the keyboard on screen and be able to dismiss it.

remoting/ios/client_keyboard.mm

+// Copyright 2017 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.
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#import "remoting/ios/client_keyboard.h"
+
+// TODO(nicholss): Look into inputAccessoryView to get the top bar for sending
+// special keys.
+// TODO(nicholss): Look into inputView - The custom input view to display when
+// the receiver becomes the first responder
+
+@implementation ClientKeyboard
+
+@synthesize autocapitalizationType = _autocapitalizationType;
+@synthesize autocorrectionType = _autocorrectionType;
+@synthesize keyboardAppearance = _keyboardAppearance;
+@synthesize keyboardType = _keyboardType;
+@synthesize spellCheckingType = _spellCheckingType;
+
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    _autocapitalizationType = UITextAutocapitalizationTypeNone;
+    _autocorrectionType = UITextAutocorrectionTypeNo;
+    _autocorrectionType = UITextAutocorrectionTypeNo;
+    _keyboardType = UIKeyboardTypeASCIICapable;
+    _spellCheckingType = UITextSpellCheckingTypeNo;
+  }
+  return self;
+}
+
+#pragma mark - UIKeyInput
+
+- (void)insertText:(NSString*)text {
+  NSLog(@"insertText: %@", text);
+}
+
+- (void)deleteBackward {
+  NSLog(@"deleteBackward");
+}
+
+- (BOOL)hasText {
+  return NO;  // not sure if this enables the back button.
+}
+
+#pragma mark - UIResponder
+
+- (BOOL)canBecomeFirstResponder {
+  return YES;
+}
+
+- (UIView*)inputAccessoryView {
+  return nil;
+}
+
+#pragma mark - UITextInputTraits
+
+@end