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

components/cronet/ios/BUILD.gn

Index: components/cronet/ios/BUILD.gn
diff --git a/components/cronet/ios/BUILD.gn b/components/cronet/ios/BUILD.gn
index 027b66da0ae8ce294923041194f8c9415798fe85..7b7afa1857ad5a802bfe4db7f10df892ffa6ef15 100644
--- a/components/cronet/ios/BUILD.gn
+++ b/components/cronet/ios/BUILD.gn
@@ -8,6 +8,7 @@ import("//build/config/mac/symbols.gni")
 import("//build/mac/tweak_info_plist.gni")
 import("//build/util/process_version.gni")
 import("//build/util/version.gni")
+import("//components/grpc_support/include/headers.gni")
 import("//testing/test.gni")
 import("//url/features.gni")
 
@@ -33,6 +34,7 @@ source_set("cronet_sources") {
   deps = [
     ":cronet_version_header",
     "//base:base",
+    "//components/grpc_support",
     "//components/metrics:metrics",
     "//components/metrics/proto:proto",
     "//components/prefs:prefs",
@@ -47,10 +49,6 @@ source_set("cronet_sources") {
     "../stale_host_resolver.h",
     "../url_request_context_config.cc",
     "../url_request_context_config.h",
-    "cronet_bidirectional_stream.cc",
-    "cronet_bidirectional_stream.h",
-    "cronet_c_for_grpc.cc",
-    "cronet_c_for_grpc.h",
     "cronet_environment.cc",
     "cronet_environment.h",
   ]
@@ -78,11 +76,15 @@ ios_framework_bundle("cronet_framework") {
 
   libs = [ "UIKit.Framework" ]
 
-  public_headers = [
-    "Cronet.h",
-    "cronet_c_for_grpc.h",
+  include_dirs = [ "//components/grpc_support/include" ]
+
+  public_deps = [
+    "//components/grpc_support",
   ]
 
+  public_headers = [ "Cronet.h" ]
+  public_headers += grpc_public_headers
+
   sources = [
     "Cronet.h",
     "Cronet.mm",
@@ -120,6 +122,7 @@ test("cronet_test") {
     ":cronet_version_header",
     "//base",
     "//base:i18n",
+    "//components/grpc_support",
     "//net",
     "//net:simple_quic_tools",
     "//net:test_support",