Upstream JavaScript injection for iOS

ios/web/public/web_state/js/crw_js_injection_receiver.h

Index: ios/web/public/web_state/js/crw_js_injection_receiver.h
diff --git a/ios/web/public/web_state/js/crw_js_injection_receiver.h b/ios/web/public/web_state/js/crw_js_injection_receiver.h
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+// 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 IOS_WEB_PUBLIC_WEB_STATE_JS_CRW_JS_INJECTION_RECEIVER_H_
+#define IOS_WEB_PUBLIC_WEB_STATE_JS_CRW_JS_INJECTION_RECEIVER_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/web/public/web_state/js/crw_js_injection_evaluator.h"
+
+@class CRWJSInjectionManager;
+
+// CRWJSInjectionReceiver injects JavaScript into a web view.
+@interface CRWJSInjectionReceiver : NSObject<CRWJSInjectionEvaluator>
+
+// Init with JavaScript evaluator.
+- (id)initWithEvaluator:(id<CRWJSInjectionEvaluator>)evaluator;
+
+// Returns an instance of |jsInjectionManagerClass|. Instances of the classes
+// it depends on are created if needed.
+- (CRWJSInjectionManager*)instanceOfClass:(Class)jsInjectionManagerClass;
+
+@end
+
+@interface CRWJSInjectionReceiver (Testing)
+// Returns a dictionary of instantiated managers keyed by class.
+- (NSDictionary*)managers;
+@end
+
+#endif  // IOS_WEB_PUBLIC_WEB_STATE_JS_CRW_JS_INJECTION_RECEIVER_H_