Upstream JavaScript injection for iOS

ios/web/public/test/crw_test_js_injection_receiver.mm

+// Copyright 2013 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/public/test/crw_test_js_injection_receiver.h"
+
+#import <UIKit/UIKit.h>
+
+#import "base/mac/scoped_nsobject.h"
+#import "ios/web/public/web_state/js/crw_js_injection_evaluator.h"
+
+@interface CRWTestUIWebViewEvaluator : NSObject<CRWJSInjectionEvaluator> {
+  base::scoped_nsobject<UIWebView> _webView;
+}
+@end
+
+@implementation CRWTestUIWebViewEvaluator
+
+- (id) init {
+  if (self = [super init])
+    _webView.reset([[UIWebView alloc] init]);
+  return self;
+}
+
+#pragma mark -
+#pragma mark CRWJSInjectionEvaluatorMethods
+
+- (void)evaluateJavaScript:(NSString*)script
+       stringResultHandler:(web::JavaScriptCompletion)handler {
+  dispatch_async(dispatch_get_main_queue(), ^{
+      // TODO(shreyasv): Change to weaknsobject once weaknsobject is moved to
+      // ios/base.
+      NSString* result =
+          [_webView stringByEvaluatingJavaScriptFromString:script];
+      if (handler)
+        handler(result, nil);
+  });
+}
+
+- (BOOL)scriptHasBeenInjectedForClass:(Class)jsInjectionManagerClass
+                       presenceBeacon:(NSString*)beacon {
+  NSString* result = [_webView stringByEvaluatingJavaScriptFromString:
+      [NSString stringWithFormat:@"typeof %@", beacon]];
+  return [result isEqualToString:@"object"];
+}
+
+- (void)injectScript:(NSString*)script
+            forClass:(Class)jsInjectionManagerClass {
+  [_webView stringByEvaluatingJavaScriptFromString:script];
+}
+
+@end
+
+@interface CRWTestJSInjectionReceiver () {
+  base::scoped_nsobject<CRWTestUIWebViewEvaluator> evaluator_;
+}
+@end
+
+@implementation CRWTestJSInjectionReceiver
+
+- (id)init {
+  base::scoped_nsobject<CRWTestUIWebViewEvaluator> evaluator(
+      [[CRWTestUIWebViewEvaluator alloc] init]);
+  if (self = [super initWithEvaluator:evaluator])
+    evaluator_.swap(evaluator);
+  return self;
+}
+
+@end