Add skia_use_android_framework_defines GYP_DEFINE

gyp/common_conditions.gypi

Index: gyp/common_conditions.gypi
diff --git a/gyp/common_conditions.gypi b/gyp/common_conditions.gypi
index ba4337403d99621a1c1ed291715a1c919cd459b5..060a08dc1cf443649ca6e6be9a5899e61af0b609 100644
--- a/gyp/common_conditions.gypi
+++ b/gyp/common_conditions.gypi
@@ -401,6 +401,15 @@
       ],
     }],
 
+    ['skia_use_android_framework_defines', {

[scroggo, 2015/07/22 13:02:43]

Could you add a comment why this is necessary, here and/or in
common_variables.gypi?

[borenet, 2015/07/22 13:32:35]

Done.

+      'includes' : [
+        'skia_for_android_framework_defines.gypi',
+      ],
+      'defines': [
+        '<@(skia_for_android_framework_defines)',
+      ],
+    }],
+
     [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos"]',
       {
         'defines': [