Upstream two UI-related test utilities for iOS

This upstreams two test utility files:
- KeyboardAppearanceListener, which watches for the software keyboard
  showing and hiding
- ui_view_test_utils, which can Dismiss any visible alerts, and can
  force the display of a view (to ensure state changes that the OS
  might defer until drawing take effect).

These are located in ui/ as they will be used in both ios/web/ and
ios/chrome/.

BUG=464810

Review URL: https://codereview.chromium.org/1122543002

Cr-Commit-Position: refs/heads/master@{#328775}

ui/base/test/ios/keyboard_appearance_listener.h

@@ -0,0 +1,18 @@
+// Copyright 2012 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.
+
+#ifndef UI_BASE_TEST_IOS_KEYBOARD_APPEARANCE_LISTENER_H_
+#define UI_BASE_TEST_IOS_KEYBOARD_APPEARANCE_LISTENER_H_
+
+#import <UIKit/UIKit.h>
+
+// Listener to observe the keyboard coming up or down.
+@interface KeyboardAppearanceListener : NSObject
+
+// Returns YES if the keyboard is currently visible.
+@property(nonatomic, readonly, getter=isKeyboardVisible) bool keyboardVisible;
+
+@end
+
+#endif  // UI_BASE_TEST_IOS_KEYBOARD_APPEARANCE_LISTENER_H_

ui/base/test/ios/keyboard_appearance_listener.mm

@@ -0,0 +1,46 @@
+// Copyright 2012 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 "ui/base/test/ios/keyboard_appearance_listener.h"
+
+#include <vector>
+
+@implementation KeyboardAppearanceListener {
+ @private
+  std::vector<id> _notificationObservers;
+}
+
+@synthesize keyboardVisible = _keyboardVisible;
+
+- (id)init {
+  self = [super init];
+  if (self) {
+    NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
+    _notificationObservers.push_back(
+        [center addObserverForName:UIKeyboardDidShowNotification
+                            object:nil
+                             queue:nil
+                        usingBlock:^(NSNotification* arg) {
+                          _keyboardVisible = true;
+                        }]);
+    _notificationObservers.push_back(
+        [center addObserverForName:UIKeyboardWillHideNotification
+                            object:nil
+                             queue:nil
+                        usingBlock:^(NSNotification* arg) {
+                          _keyboardVisible = false;
+                        }]);
+  }
+  return self;
+}
+
+- (void)dealloc {
+  NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
+  for (const auto& observer : _notificationObservers) {
+    [nc removeObserver:observer];
+  }
+  _notificationObservers.clear();
+  [super dealloc];
+}
+@end

ui/base/test/ios/ui_view_test_utils.h

@@ -0,0 +1,26 @@
+// Copyright 2014 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.
+
+#ifndef UI_BASE_TEST_IOS_UI_VIEW_TEST_UTILS_H_
+#define UI_BASE_TEST_IOS_UI_VIEW_TEST_UTILS_H_
+
+#import <UIKit/UIKit.h>
+
+namespace ui {
+namespace test {
+namespace uiview_utils {
+
+// Cancels any visible UIAlertViews.
+void CancelAlerts();
+
+// Forces rendering of a UIView. This is used in tests to make sure that UIKit
+// optimizations don't have the views return the previous values (such as
+// zoomScale).
+void ForceViewRendering(UIView* view);
+
+}  // namespace uiview_utils
+}  // test
+}  // namespace ui
+
+#endif  // UI_BASE_TEST_IOS_UI_VIEW_TEST_UTILS_H_

ui/base/test/ios/ui_view_test_utils.mm

@@ -0,0 +1,38 @@
+// Copyright 2014 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/base/test/ios/ui_view_test_utils.h"
+
+#include "base/logging.h"
+
+namespace ui {
+namespace test {
+namespace uiview_utils {
+
+void CancelAlerts() {
+  for (UIWindow* window in [UIApplication sharedApplication].windows) {
+    for (UIView* view in [window subviews]) {
+      if ([view isKindOfClass:[UIAlertView class]]) {
+        UIAlertView* alertView = (UIAlertView*)view;
+        [alertView dismissWithClickedButtonIndex:0 animated:NO];
+      }
+    }
+  }
+}
+
+void ForceViewRendering(UIView* view) {
+  DCHECK(view);
+  CALayer* layer = view.layer;
+  DCHECK(layer);
+  // 19 is an arbitrary non-zero value.
+  UIGraphicsBeginImageContext(CGSizeMake(19, 19));
+  CGContext* context = UIGraphicsGetCurrentContext();
+  DCHECK(context);
+  [layer renderInContext:context];
+  UIGraphicsEndImageContext();
+}
+
+}  // namespace uiview_utils
+}  // namespace test
+}  // namespace ui

ui/base/ui_base.gyp

@@ -633,6 +633,7 @@
     {
       # GN version: //ui/base:test_support
       'target_name': 'ui_base_test_support',
+      'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../skia/skia.gyp:skia',
@@ -642,6 +643,10 @@
       ],
       'sources': [
         # Note: file list duplicated in GN build.
+        'test/ios/keyboard_appearance_listener.h',
+        'test/ios/keyboard_appearance_listener.mm',
+        'test/ios/ui_view_test_utils.h',
+        'test/ios/ui_view_test_utils.mm',
         'test/test_clipboard.cc',
         'test/test_clipboard.h',
         'test/ui_controls.h',
@@ -656,23 +661,15 @@
       ],
       'conditions': [
         ['OS!="ios"', {
-          'type': 'static_library',
-            'dependecies': [
-              'ime/ui_base_ime.gyp:ui_base_ime',
-            ],
-            'sources': [
-              'ime/dummy_input_method.cc',
-              'ime/dummy_input_method.h',
-              'ime/dummy_text_input_client.cc',
-              'ime/dummy_text_input_client.h',
-            ],
-        }, {  # OS=="ios"
-          # None of the sources in this target are built on iOS, resulting in
-          # link errors when building targets that depend on this target
-          # because the static library isn't found. If this target is changed
-          # to have sources that are built on iOS, the target should be changed
-          # to be of type static_library on all platforms.
-          'type': 'none',
+          'dependecies': [
+            'ime/ui_base_ime.gyp:ui_base_ime',
+          ],
+          'sources': [
+            'ime/dummy_input_method.cc',
+            'ime/dummy_input_method.h',
+            'ime/dummy_text_input_client.cc',
+            'ime/dummy_text_input_client.h',
+          ],
         }],
         ['use_aura==1', {
           'sources!': [