Upstream (most of) ios/web/public

ios/web/public/browser_url_rewriter.h

Index: ios/web/public/browser_url_rewriter.h
diff --git a/ios/web/public/browser_url_rewriter.h b/ios/web/public/browser_url_rewriter.h
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+// Copyright 2015 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_BROWSER_URL_REWRITER_H_
+#define IOS_WEB_PUBLIC_BROWSER_URL_REWRITER_H_
+
+class GURL;
+
+namespace web {
+
+class BrowserState;
+
+// Some special browser-level URLs (like "about:version") are handled before
+// actually being loaded by the web view, allowing the embedder to optionally
+// convert them to app-specific URLs that to be handled using
+// CRWNativeContentProviders.
+class BrowserURLRewriter {
+ public:
+  // The type of functions that can process a URL.  URLRewriters return true if
+  // |url| is ready to be loaded and added to the NavigationManager.  They can
+  // optionally modify |url| regardless of whether they return true or false.
+  typedef bool (*URLRewriter)(GURL* url, BrowserState* browser_state);
+
+  // Returns the singleton instance.
+  static BrowserURLRewriter* GetInstance();
+
+  // RewriteURLIfNecessary gives all registered URLRewriters a shot at
+  // processing the given URL, and modifies it in place.
+  virtual void RewriteURLIfNecessary(GURL* url,
+                                     BrowserState* browser_state) = 0;
+
+  // Adds |rewriter| to the list of URL rewriters.  |rewriter| must not be null.
+  virtual void AddURLRewriter(URLRewriter rewriter) = 0;
+
+ protected:
+  virtual ~BrowserURLRewriter() {}
+};
+
+}  // namespace web
+
+#endif  // IOS_WEB_PUBLIC_BROWSER_URL_REWRITER_H_