Allow configuration of info_plist_{,target} in ios_xctest_test.

build/config/ios/rules.gni

Index: build/config/ios/rules.gni
diff --git a/build/config/ios/rules.gni b/build/config/ios/rules.gni
index 5ee83af5b81dfaa30cf77328ccf455fe682ffee7..1c2ce941a1123dc523bfd87abe88a8bb3e60b48c 100644
--- a/build/config/ios/rules.gni
+++ b/build/config/ios/rules.gni
@@ -1174,9 +1174,12 @@ template("ios_xctest_test") {
 
     testonly = true
     output_name = _host_output
-    info_plist = "//build/config/ios/Host-Info.plist"
     configs += [ "//build/config/ios:xctest_config" ]
 
+    if (!defined(invoker.info_plist) && !defined(invoker.info_plist_target)) {
+      info_plist = "//build/config/ios/Host-Info.plist"

[olivierrobin, 2016/07/26 12:51:34]

should we not use info_plist_target if it is defined?

[sdefresne, 2016/07/26 12:52:46]

We already forward the "info_plist" if it is defined with the
"forward_variables_from" call earlier. Here we only set a default value if
neither info_plist nor info_plist_target where defined by the invoker.

+    }
+
     # Xcode needs those two framework installed in the application (and signed)
     # for the XCTest to run, so install them using extra_system_frameworks.
     _ios_platform_library = "$ios_sdk_platform_path/Developer/Library"