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

ios/web_view/public/cwv_web_view.h

Index: ios/web_view/public/cwv_web_view.h
diff --git a/ios/web_view/public/cwv_web_view.h b/ios/web_view/public/cwv_web_view.h
index b8e5f73c48c47bb178ee7745ab7c14d4b36f1daf..9413a5bdb01bdca24d43848a9d6f8720367869c4 100644
--- a/ios/web_view/public/cwv_web_view.h
+++ b/ios/web_view/public/cwv_web_view.h
@@ -6,6 +6,12 @@
 
 #import <UIKit/UIKit.h>
 
+#if defined(CWV_IMPLEMENTATION)
+#include "ios/web_view/public/cwv_export.h"
+#else
+#include <ChromeWebView/cwv_export.h>
+#endif
+
 @class CWVWebViewConfiguration;
 @protocol CWVUIDelegate;
 @protocol CWVTranslateDelegate;
@@ -18,7 +24,7 @@
 // Customizable Context Menus, and maybe more.
 //
 // Concrete instances can be created through CWV.
-@interface CWVWebView : UIView
+CWV_EXPORT @interface CWVWebView : UIView
 
 // The view used to display web content.
 @property(nonatomic, readonly) UIView* view;