ios: add CrNet

ios/crnet/crnet_consumer/crnet_consumer_app_delegate.mm

+// 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 "crnet_consumer_app_delegate.h"
+
+#import "CrNet.h"
+#include "base/format_macros.h"
+#import "crnet_consumer_view_controller.h"
+
+@implementation CrNetConsumerAppDelegate {
+  NSUInteger _counter;
+}
+
+@synthesize window;
+@synthesize viewController;
+
+// Returns a file name to save net internals logging. This method suffixes
+// the ivar |_counter| to the file name so a new name can be obtained by
+// modifying that.
+- (NSString *)currentNetLogFileName {
+  return [NSString
+      stringWithFormat:@"crnet-consumer-net-log%" PRIuNS ".json", _counter];
+}
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  [CrNet setPartialUserAgent:@"Dummy/1.0"];
+  [CrNet setQuicEnabled:YES];
+  // Always use QUIC if able.
+  [CrNet setAlternateProtocolThreshold:0.0];
+  [CrNet install];
+  [CrNet startNetLogToFile:[self currentNetLogFileName] logBytes:NO];
+
+  NSURLSessionConfiguration* config =
+      [NSURLSessionConfiguration ephemeralSessionConfiguration];
+  [CrNet installIntoSessionConfiguration:config];
+
+  // Just for fun, don't route chromium.org requests through CrNet.
+  //
+  // |chromiumPrefix| is declared outside the scope of the request block so that
+  // the block references something outside of its own scope, and cannot be
+  // declared as a global block. This makes sure the block is
+  // an __NSStackBlock__, and verifies the fix for http://crbug.com/436175 .
+  NSString *chromiumPrefix = @"www.chromium.org";
+  [CrNet setRequestFilterBlock:^BOOL (NSURLRequest *request) {
+      BOOL isChromiumSite = [[[request URL] host] hasPrefix:chromiumPrefix];
+      return !isChromiumSite;
+  }];
+
+  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+  self.viewController =
+      [[CrNetConsumerViewController alloc] initWithNibName:nil bundle:nil];
+  self.window.rootViewController = self.viewController;
+  [self.window makeKeyAndVisible];
+
+  return YES;
+}
+
+- (void)applicationDidEnterBackground:(UIApplication *)application {
+  [CrNet stopNetLog];
+  [CrNet clearCacheWithCompletionCallback:^(int error) {
+    NSLog(@"Cache cleared: %d\n", error);
+  }];
+}
+
+- (void)applicationWillEnterForeground:(UIApplication *)application {
+  _counter++;
+  [CrNet startNetLogToFile:[self currentNetLogFileName] logBytes:NO];
+}
+
+@end