Disable video_engine_tests and webrtc_perf_tests on Android.

BUG=3770
TESTED=Running the tests locally on an Android device.
R=phoglund@webrtc.org
TBR=henrik.lundin@webrtc.org, pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/14299004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@7026 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc_tests.gypi b/webrtc_tests.gypi
index ab71429..4bbc5df 100644
--- a/webrtc_tests.gypi
+++ b/webrtc_tests.gypi
@@ -104,6 +104,9 @@
         'video/full_stack.cc',
         'video/rampup_tests.cc',
         'video/rampup_tests.h',
+        # Needed to make the test binary pass since all tests are disabled on
+        # Android (webrtc:3770).
+        'test/testsupport/always_passing_unittest.cc',
       ],
       'dependencies': [
         '<(DEPTH)/testing/gtest.gyp:gtest',