Chromecast: make CAST_IS_DEBUG_BUILD to macro CAST_IS_DEBUG_BUILD().

chromecast/chromecast.gyp

Index: chromecast/chromecast.gyp
diff --git a/chromecast/chromecast.gyp b/chromecast/chromecast.gyp
index c5ad4fb1f77537198982e6d484c3f8a11b747cbe..242d4da5df63a802980d8bb2dc09e49f40203785 100644
--- a/chromecast/chromecast.gyp
+++ b/chromecast/chromecast.gyp
@@ -7,6 +7,7 @@
     'android_support_v13_target%':
         '../third_party/android_tools/android_tools.gyp:android_support_v13_javalib',
     'cast_build_release': 'internal/build/cast_build_release',
+    'cast_is_debug_build%': 0,
     'chromium_code': 1,
     'chromecast_branding%': 'Chromium',
     'disable_display%': 0,
@@ -336,7 +337,7 @@
             # CAST_BUILD_RELEASE is taken from cast_build_release file if exist;
             # otherwise, a dev string is used.
             '-e', 'CAST_BUILD_RELEASE="<!(if test -f <(cast_build_release); then cat <(cast_build_release); else echo eng.${USER}; fi)"',
-            '-e', 'CAST_IS_DEBUG_BUILD=1 if "<(CONFIGURATION_NAME)" == "Debug" else 0',
+            '-e', 'CAST_IS_DEBUG_BUILD=1 if "<(CONFIGURATION_NAME)" == "Debug" or <(cast_is_debug_build) == 1 else 0',
             'common/version.h.in',
             '<@(_outputs)',
           ],