Add web shell matcher for address field.

ios/web/shell/test/earl_grey/shell_matchers.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/web/shell/test/earl_grey/shell_matchers.h"
 
+#include "base/test/ios/wait_util.h"
+#include "ios/testing/earl_grey/wait_util.h"
 #import "ios/web/public/web_state/web_state.h"
 #import "ios/web/public/test/earl_grey/web_view_matchers.h"
 #import "ios/web/shell/test/app/web_shell_test_util.h"
 #import "ios/web/shell/view_controller.h"
 
 namespace web {
 
-// Shorthand for GREYMatchers::matcherForWebViewContainingText.
 id<GREYMatcher> webViewContainingText(NSString* text) {
   return [GREYMatchers matcherForWebViewContainingText:text];
 }
 
+id<GREYMatcher> addressFieldText(NSString* text) {
+  return [GREYMatchers matcherForAddressFieldTextEqualTo:text];
+}
+
 id<GREYMatcher> backButton() {
   return [GREYMatchers matcherForWebShellBackButton];
 }
 
 id<GREYMatcher> forwardButton() {
   return [GREYMatchers matcherForWebShellForwardButton];
 }
 
 id<GREYMatcher> addressField() {
   return [GREYMatchers matcherForWebShellAddressField];
 }
 
 }  // namespace web
 
 @implementation GREYMatchers (WebShellAdditions)
 
 + (id<GREYMatcher>)matcherForWebViewContainingText:(NSString*)text {
   web::WebState* webState = web::web_shell_test_util::GetCurrentWebState();
   return web::webViewContainingText(text, webState);
 }
 
++ (id<GREYMatcher>)matcherForAddressFieldTextEqualTo:(NSString*)text {
+  MatchesBlock matches = ^BOOL(UIView* view) {
+    if (![view isKindOfClass:[UITextField class]]) {
+      return NO;
+    }
+    if (![[view accessibilityLabel]
+            isEqualToString:kWebShellAddressFieldAccessibilityLabel]) {
+      return NO;
+    }
+    UITextField* textField = static_cast<UITextField*>(view);

[Eugene But (OOO till 7-30), 2016/05/09 15:59:08]

base::mac::ObjCCastStrict

[baxley, 2016/05/09 17:11:43]

Done.

+
+    NSDate* deadline = [NSDate
+        dateWithTimeIntervalSinceNow:earl_grey_support::kWaitForElementTimeout];

[Eugene But (OOO till 7-30), 2016/05/09 15:59:08]

Can be changed later.

This is repetitive code, which probably should be factored to wait utils.

[baxley, 2016/05/09 17:11:43]

Acknowledged.

+    while ([[NSDate date] compare:deadline] != NSOrderedDescending) {
+      if ([textField.text isEqualToString:text]) {
+        return YES;
+      }
+      base::test::ios::SpinRunLoopWithMaxDelay(
+          base::TimeDelta::FromSecondsD(earl_grey_support::kSpinDelaySeconds));
+    }
+    return NO;
+  };
+
+  DescribeToBlock describe = ^(id<GREYDescription> description) {
+    [description

[Eugene But (OOO till 7-30), 2016/05/09 15:59:08]

Optional NIT: 

[description appendText:@"web view containing "];
[description appendText:text];

[baxley, 2016/05/09 17:11:43]

Done.

+        appendText:[NSString stringWithFormat:@"web view containing %@", text]];
+  };
+
+  return [[[GREYElementMatcherBlock alloc] initWithMatchesBlock:matches
+                                               descriptionBlock:describe]
+      autorelease];
+}
+
 + (id<GREYMatcher>)matcherForWebShellBackButton {
   return grey_accessibilityLabel(kWebShellBackButtonAccessibilityLabel);
 }
 
 + (id<GREYMatcher>)matcherForWebShellForwardButton {
   return grey_accessibilityLabel(kWebShellForwardButtonAccessibilityLabel);
 }
 
 + (id<GREYMatcher>)matcherForWebShellAddressField {
   return grey_accessibilityLabel(kWebShellAddressFieldAccessibilityLabel);
 }
 
 @end