Disable SK_GAMMA_SRGB on android builds.

R=bungeman@google.com, scroggo@google.com

Review URL: https://codereview.chromium.org/229133003

git-svn-id: http://skia.googlecode.com/svn/trunk@14148 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/common_conditions.gypi b/gyp/common_conditions.gypi
index 92fb819..3cf5a63 100644
--- a/gyp/common_conditions.gypi
+++ b/gyp/common_conditions.gypi
@@ -552,6 +552,14 @@
         'defines': [
           'SK_BUILD_FOR_ANDROID',
           'SK_FONTHOST_DOES_NOT_USE_FONTMGR',
+
+          # Android Text Tuning
+          'SK_GAMMA_EXPONENT=1.4',
+          'SK_GAMMA_CONTRAST=0.0',
+        ],
+        # Android defines a fixed gamma exponent instead of using SRGB
+        'defines!': [
+          'SK_GAMMA_SRGB',
         ],
         'configurations': {
           'Debug': {