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

components/cronet/ios/cronet_consumer/BUILD.gn

 # Copyright 2016 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("//build/config/ios/rules.gni")
 
-ios_app_bundle("cronet_consumer") {
-  info_plist = "cronet-consumer-Info.plist"
+template("cronet_consumer_template") {
+  _target_name = target_name
 
+  ios_app_bundle(_target_name) {
+    info_plist = "cronet-consumer-Info.plist"
+
+    deps = [
+      "//base:base",
+
+      # All shared libraries must have the sanitizer deps to properly link in
+      # asan mode (this target will be empty in other cases).
+      "//build/config/sanitizers:deps",
+    ]
+
+    deps += invoker.deps
+
+    if (defined(invoker.bundle_deps)) {
+      bundle_deps = invoker.bundle_deps
+    }
+
+    sources = [
+      "cronet_consumer_app_delegate.h",
+      "cronet_consumer_app_delegate.mm",
+      "cronet_consumer_view_controller.h",
+      "cronet_consumer_view_controller.m",
+      "main.mm",
+    ]
+
+    configs += [ "//build/config/compiler:enable_arc" ]
+  }
+}
+
+cronet_consumer_template("cronet_consumer") {
   deps = [
-    "//base:base",
     "//components/cronet/ios:cronet_framework+link",
+  ]
+  bundle_deps = [ "//components/cronet/ios:cronet_framework+bundle" ]
+}
 
-    # All shared libraries must have the sanitizer deps to properly link in
-    # asan mode (this target will be empty in other cases).
-    "//build/config:exe_and_shlib_deps",
+cronet_consumer_template("cronet_consumer_static") {
+  deps = [
+    # TODO(mef): This dep is used to make #import <Cronet/Cronet.h> work.

[kapishnikov, 2017/05/23 21:37:46]

I think we should fix it. Linking two frameworks doesn't seem right.

[jzw1, 2017/05/24 06:15:26]

Might be related, but when I build this on device I get:
dyld: Library not loaded: @rpath/Cronet.framework/Cronet
  Referenced from:
/var/containers/Bundle/Application/0DED222D-1A82-48A0-A205-FBD6E460F6BF/cronet_consumer_static.app/cronet_consumer_static
  Reason: image not found

[mef, 2017/05/24 21:36:59]

Yes, I think it is a result of linking cronet_framework but not including it
into the bundle.
I still don't know how to make it work though.

[mef, 2017/05/24 21:36:59]

I agree that it is not great, and will be happy to fix it if there are good
ideas how. 
I *think* it needs some public config magic combined with header maps. 
I'm open for suggestions.

+    # Fix cronet_static_framework to provide similar config.
+    "//components/cronet/ios:cronet_framework+link",
+    "//components/cronet/ios:cronet_static_framework",
   ]
-
-  sources = [
-    "cronet_consumer_app_delegate.h",
-    "cronet_consumer_app_delegate.mm",
-    "cronet_consumer_view_controller.h",
-    "cronet_consumer_view_controller.m",
-    "main.mm",
-  ]
-
-  bundle_deps = [ "//components/cronet/ios:cronet_framework+bundle" ]
-
-  configs += [ "//build/config/compiler:enable_arc" ]
 }