Upstream web_controller_provider and dependencies

ios/web/public/block_types.h

Index: ios/web/public/block_types.h
diff --git a/ios/web/public/block_types.h b/ios/web/public/block_types.h
new file mode 100644
index 0000000000000000000000000000000000000000..8074dc04e69856c886dd9480cf46f2cb011a4062
--- /dev/null
+++ b/ios/web/public/block_types.h
@@ -0,0 +1,18 @@
+// 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_BLOCK_TYPES_H_
+#define IOS_WEB_PUBLIC_BLOCK_TYPES_H_
+
+#import <Foundation/Foundation.h>
+
+namespace web {
+
+// The type of the completion handler block that is called to inform about
+// JavaScript evaluation completion.
+typedef void (^JavaScriptCompletion)(NSString*, NSError*);
+
+}  // namespace
+
+#endif  // IOS_WEB_PUBLIC_BLOCK_TYPES_H_