[cronet] Expose API to set experimental options

components/cronet/ios/test/cronet_http_test.mm

 // 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.
 
 #import <Cronet/Cronet.h>
 #import <Foundation/Foundation.h>
 
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 145 matching lines @@
     [task resume];
     int64_t deadline_ns = 1 * ns_in_second;
     dispatch_semaphore_wait([delegate_ semaphore],
                             dispatch_time(DISPATCH_TIME_NOW, deadline_ns));
   }
 
   base::scoped_nsobject<NSURLSession> session_;
   base::scoped_nsobject<TestDelegate> delegate_;
 };
 
+TEST_F(HttpTest, CreateFile) {
+  bool ssl_file_created = [[NSFileManager defaultManager]
+      fileExistsAtPath:[Cronet getNetLogPathForFile:@"SSLKEYLOGFILE"]];
+
+  [[NSFileManager defaultManager]
+      removeItemAtPath:[Cronet getNetLogPathForFile:@"SSLKEYLOGFILE"]
+                 error:nil];
+
+  EXPECT_TRUE(ssl_file_created);
+}
+
 TEST_F(HttpTest, NSURLSessionReceivesData) {
   NSURL* url = net::NSURLWithGURL(GURL(grpc_support::kTestServerUrl));
   __block BOOL block_used = NO;
   NSURLSessionDataTask* task = [session_ dataTaskWithURL:url];
   [Cronet setRequestFilterBlock:^(NSURLRequest* request) {
     block_used = YES;
     EXPECT_EQ([request URL], url);
     return YES;
   }];
   StartDataTaskAndWaitForCompletion(task);
@@ skipping 233 matching lines @@
   [Cronet setRequestFilterBlock:^(NSURLRequest* request) {
     EXPECT_TRUE(false) << "Block should not be called for unsupported requests";
     return YES;
   }];
   StartDataTaskAndWaitForCompletion(task);
   EXPECT_EQ(nil, [delegate_ error]);
   EXPECT_TRUE([[delegate_ responseBody] containsString:testString]);
 }
 
 }  // namespace cronet