MIPS: modified gypi files to support build

R=teodora.petrovic@gmail.com, djsollen@google.com

Author: djordje.pesut@imgtec.com

Review URL: https://codereview.chromium.org/304903003
diff --git a/gyp/common_variables.gypi b/gyp/common_variables.gypi
index c8b069c..f0c065f 100644
--- a/gyp/common_variables.gypi
+++ b/gyp/common_variables.gypi
@@ -189,6 +189,8 @@
     'arm_version%': '<(arm_version)',
     'arm_neon%': '<(arm_neon)',
     'arm_neon_optional%': 0,
+    'mips_arch_variant%': 'mips32',
+    'mips_dsp%': 0,
     'skia_os%': '<(skia_os)',
     'os_posix%': '<(os_posix)',