Add support for loading API keys from Info.plist on iOS and macOS.

google_apis/google_api_keys_unittest.cc

Index: google_apis/google_api_keys_unittest.cc
diff --git a/google_apis/google_api_keys_unittest.cc b/google_apis/google_api_keys_unittest.cc
index a04b32263da665df4ac49cdb527b1c5649361bdd..1f641020bd0dfc071fb64b1ebc8a69eb90980f4f 100644
--- a/google_apis/google_api_keys_unittest.cc
+++ b/google_apis/google_api_keys_unittest.cc
@@ -42,6 +42,7 @@
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/strings/stringize_macros.h"
+#include "google_apis/google_api_keys_mac.h"

[Roger Tawa OOO till Jul 10th, 2016/08/08 18:03:05]

Should this be in an #ifdef?

[bzanotti, 2016/08/10 13:23:40]

Yes, this unit test is ran on Linux as well where it makes no sense to include
this header. Done.

 
 // This is the default baked-in value for OAuth IDs and secrets.
 static const char kDummyToken[] = "dummytoken";