Export all CWV* symbols from the ios/web_view dynamic library.

ios/web_view/public/cwv_html_element.h

Index: ios/web_view/public/cwv_html_element.h
diff --git a/ios/web_view/public/cwv_html_element.h b/ios/web_view/public/cwv_html_element.h
index cf7a7ea7293b640224fe1ee8244a4ef5bf555e9e..f0f8cd12d74bdd5cba656c090870387eb016454d 100644
--- a/ios/web_view/public/cwv_html_element.h
+++ b/ios/web_view/public/cwv_html_element.h
@@ -7,9 +7,15 @@
 
 #import <Foundation/Foundation.h>
 
+#if defined(CWV_IMPLEMENTATION)
+#include "ios/web_view/public/cwv_export.h"
+#else
+#include <ChromeWebView/cwv_export.h>
+#endif
+
 // Encapsulates information about HTML element. Used in
 // delegate methods.
-@interface CWVHTMLElement : NSObject
+CWV_EXPORT @interface CWVHTMLElement : NSObject
 
 // |href| property of an HTML element.
 @property(nullable, copy, readonly) NSURL* hyperlink;