Add Random unit tests.

https://codereview.appspot.com/7306066/


git-svn-id: http://skia.googlecode.com/svn/trunk@7670 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/tests.gyp b/gyp/tests.gyp
index 10e99d2..082336f 100644
--- a/gyp/tests.gyp
+++ b/gyp/tests.gyp
@@ -77,6 +77,7 @@
         '../tests/PointTest.cpp',
         '../tests/PremulAlphaRoundTripTest.cpp',
         '../tests/QuickRejectTest.cpp',
+        '../tests/RandomTest.cpp',
         '../tests/Reader32Test.cpp',
         '../tests/ReadPixelsTest.cpp',
         '../tests/ReadWriteAlphaTest.cpp',