Moving gRPC support interfaces out of cronet and into a new component.

components/cronet/ios/cronet_environment.h

Index: components/cronet/ios/cronet_environment.h
diff --git a/components/cronet/ios/cronet_environment.h b/components/cronet/ios/cronet_environment.h
index 30f29ea2c9f4ee3ebde133a822fc226e0a79a247..baf7c735f312f88bcd51792dc9cf6b2574d53319 100644
--- a/components/cronet/ios/cronet_environment.h
+++ b/components/cronet/ios/cronet_environment.h
@@ -16,6 +16,7 @@
 #include "net/cert/cert_verifier.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
+#include "net/url_request/url_request_context_getter.h"
 
 class JsonPrefStore;
 
@@ -80,18 +81,17 @@ class CronetEnvironment {
     ssl_key_log_file_name_ = ssl_key_log_file_name;
   }
 
-  net::URLRequestContext* GetURLRequestContext() const;
+  // Return the URLRequestContextGetter associated with this object.
+  net::URLRequestContextGetter* GetURLRequestContextGetter();
 
-  bool IsOnNetworkThread();
+ private:
+  // Performs initialization tasks that must happen on the network thread.
+  void InitializeOnNetworkThread();
 
   // Runs a closure on the network thread.
   void PostToNetworkThread(const tracked_objects::Location& from_here,
                            const base::Closure& task);
 
- private:
-  // Performs initialization tasks that must happen on the network thread.
-  void InitializeOnNetworkThread();
-
   // Runs a closure on the file user blocking thread.
   void PostToFileUserBlockingThread(const tracked_objects::Location& from_here,
                                     const base::Closure& task);
@@ -123,6 +123,7 @@ class CronetEnvironment {
   std::unique_ptr<net::ProxyConfigService> proxy_config_service_;
   std::unique_ptr<net::HttpServerProperties> http_server_properties_;
   std::unique_ptr<net::URLRequestContext> main_context_;
+  scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
   std::string user_agent_product_name_;
   std::unique_ptr<net::NetLog> net_log_;
   std::unique_ptr<net::WriteToFileNetLogObserver> net_log_observer_;