[Cronet] Build static libcronet.a for iOS with complete dependencies.

components/cronet/ios/sample/cronet_sample_app_delegate.mm

+// Copyright 2017 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_sample_app_delegate.h"
+
+#import "components/cronet/ios/Cronet.h"
+
+#include "base/format_macros.h"
+#import "cronet_sample_view_controller.h"
+
+@implementation CronetSampleAppDelegate {
+  NSUInteger _counter;
+  dispatch_queue_t _backgroundRequestQueue;
+}
+
+@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:@"cronet_sample-net-log%" PRIuNS ".json", _counter];
+}
+
+- (BOOL)application:(UIApplication*)application
+    didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
+  [Cronet setUserAgent:@"Dummy/1.0" partial:YES];
+  [Cronet setQuicEnabled:YES];
+  [Cronet start];
+  [Cronet startNetLogToFile:[self currentNetLogFileName] logBytes:NO];
+  [Cronet registerHttpProtocolHandler];
+
+  // Just for fun, route chromium.org requests through Cronet.
+  //
+  // |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";
+  [Cronet setRequestFilterBlock:^BOOL(NSURLRequest* request) {
+    BOOL isChromiumSite = [[[request URL] host] hasPrefix:chromiumPrefix];
+    NSLog(@"RequestFilter:%@ Handling:%d", request, isChromiumSite);
+    return isChromiumSite;
+  }];
+
+  NSURLSessionConfiguration* config =
+      [NSURLSessionConfiguration ephemeralSessionConfiguration];
+  [Cronet installIntoSessionConfiguration:config];
+
+  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+  self.viewController =
+      [[CronetSampleViewController alloc] initWithNibName:nil bundle:nil];
+  self.window.rootViewController = self.viewController;
+  [self.window makeKeyAndVisible];
+
+  _backgroundRequestQueue =
+      dispatch_queue_create("Background Request Queue", NULL);
+
+  return YES;
+}
+
+- (void)performBackgroundRequest {
+  NSURL* url = [NSURL URLWithString:@"http://www.chromium.org"];
+  NSData* receivedData = [NSData dataWithContentsOfURL:url];
+  NSLog(@"ReceivedData: %@", receivedData);
+  dispatch_async(_backgroundRequestQueue, ^{
+    [self performBackgroundRequest];
+  });
+}
+
+- (void)applicationDidEnterBackground:(UIApplication*)application {
+  [Cronet stopNetLog];
+}
+
+- (void)applicationWillEnterForeground:(UIApplication*)application {
+  _counter++;
+  [Cronet startNetLogToFile:[self currentNetLogFileName] logBytes:NO];
+}
+
+- (void)applicationWillTerminate:(UIApplication*)application {
+  NSLog(@"Cronet Sample Will Terminate");
+}
+
+@end