[ios] Add framework_dir flag to all_dependent_configs (-F).

When building a custom framework, the framework and the framework_dir
flags need to be added to the command-line of every linkable target
the depends directly or indirectly on it. GN propagates properly the
framework as it knows about "libs", but the -F flag added to ldflags
need to be propagated using all_dependent_configs.

BUG=704946

Review-Url: https://codereview.chromium.org/2778813002
Cr-Original-Commit-Position: refs/heads/master@{#460071}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5376139411f2b362d24abc27425f3827697a46d4

config/ios/rules.gni

@@ -1146,13 +1146,16 @@ template("ios_framework_bundle") {
         ":$_link_target_name($default_toolchain)",
       ]
 
-      if (!defined(public_configs)) {
-        public_configs = []
-      }
-      public_configs += [ ":$_framework_public_config" ]
       if (_has_public_headers) {
+        if (!defined(public_configs)) {
+          public_configs = []
+        }
         public_configs += [ ":$_framework_headers_config" ]
       }
+      if (!defined(all_dependent_configs)) {
+        all_dependent_configs = []
+      }
+      all_dependent_configs += [ ":$_framework_public_config" ]
     }
 
     if (defined(invoker.bundle_deps)) {
@@ -1297,13 +1300,16 @@ template("ios_framework_bundle") {
       }
       public_deps += [ ":$_target_name" ]
 
-      if (!defined(public_configs)) {
-        public_configs = []
-      }
-      public_configs += [ ":$_framework_public_config" ]
       if (_has_public_headers) {
+        if (!defined(public_configs)) {
+          public_configs = []
+        }
         public_configs += [ ":$_framework_headers_config" ]
       }
+      if (!defined(all_dependent_configs)) {
+        all_dependent_configs = []
+      }
+      all_dependent_configs += [ ":$_framework_public_config" ]
     }
 
     bundle_data(_target_name + "+bundle") {