Use gtest's own implementation of tr1::tuple on Android.

testing/gtest.gyp

Index: testing/gtest.gyp
diff --git a/testing/gtest.gyp b/testing/gtest.gyp
index 2b57742e961d0e7528080dccbe79375821b8658f..cecd93698d1e45f25e9ac2df2dcbcd2fc5d6d0ea 100644
--- a/testing/gtest.gyp
+++ b/testing/gtest.gyp
@@ -78,10 +78,10 @@
             ],
           },
         }],
-        ['clang==1', {
-          # We want gtest features that use tr1::tuple, but clang currently
-          # doesn't support the variadic templates used by libstdc++'s
-          # implementation.  gtest supports this scenario by providing its
+        ['clang==1 or OS=="android"', {
+          # We want gtest features that use tr1::tuple, but we currently
+          # don't support the variadic templates used by libstdc++'s
+          # implementation. gtest supports this scenario by providing its
           # own implementation but we must opt in to it.
           'defines': [
             'GTEST_USE_OWN_TR1_TUPLE=1',