Added crnet_framework target to build CrNet dynamic framework.

ios/crnet/CrNet.h

 // Copyright 2014 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.
 
 #import <Foundation/Foundation.h>
 
 // A block, that takes a request, and returns YES if the request should
 // be handled.
 typedef BOOL(^RequestFilterBlock)(NSURLRequest *request);
 
 
 // A callback, called when the clearCache message has completed. The |errorCode|
 // is a network stack error code indicating whether the clear request succeeded
 // or not. Even if the request failed, the cache may have been cleared anyway,
 // or it may not have; it is not useful to retry a failing cache-clear attempt.
 // The only real use of |errorCode| is for error reporting and statistics
 // gathering.
 typedef void(^ClearCacheCallback)(int errorCode);
 
 // Interface for installing CrNet.
+__attribute__((visibility("default")))
 @interface CrNet : NSObject
 
-// Sets whether SPDY should be supported by CrNet. This method only has any
-// effect before |install| is called.
-+ (void)setSpdyEnabled:(BOOL)spdyEnabled;
+// Sets whether HTTP/2 should be supported by CrNet. This method only has
+// any effect before |install| is called.
++ (void)setHttp2Enabled:(BOOL)http2Enabled;
 
 // Sets whether QUIC should be supported by CrNet. This method only has any
 // effect before |install| is called.
 + (void)setQuicEnabled:(BOOL)quicEnabled;
 
 // Sets whether SDCH should be supported by CrNet. This method only has any
 // effect before |install| is called. The |filename| argument is used to specify
 // which file should be used for SDCH persistence metadata. If |filename| is
 // nil, persistence is not enabled. The default is for SDCH to be disabled.
 + (void)setSDCHEnabled:(BOOL)sdchEnabled
-         withPrefStore:(NSString*)filename;
+         withPrefStore:(NSString *)filename;
 
 // |userAgent| is expected to be of the form Product/Version.
 // Example: Foo/3.0.0.0
 //
 // This method only has any effect before |install| is called.
 + (void)setPartialUserAgent:(NSString *)userAgent;
 
 // Set the block used to determine whether or not CrNet should handle the
 // request. If this is not set, CrNet will handle all requests.
 // Must not be called while requests are in progress. This method can be called
@@ skipping 60 matching lines @@
 
 // Returns the full user-agent that the stack uses.
 // This is the exact string servers will see.
 + (NSString *)userAgent;
 
 // Clears CrNet's http cache. The supplied callback, if not nil, is run on an
 // unspecified thread.
 + (void)clearCacheWithCompletionCallback:(ClearCacheCallback)completionBlock;
 
 @end