AU: Add test-channel to the list of valid tracks.

BUG=8384
TEST=unit tests

Change-Id: Ifbf6918c70301de4437f6c161aa6d761e3ad47ba

Review URL: http://codereview.chromium.org/4520001
diff --git a/omaha_request_params_unittest.cc b/omaha_request_params_unittest.cc
index c136e06..65d86cb 100644
--- a/omaha_request_params_unittest.cc
+++ b/omaha_request_params_unittest.cc
@@ -325,11 +325,13 @@
 
 TEST_F(OmahaRequestDeviceParamsTest, IsValidTrackTest) {
   params_.SetBuildTypeOfficial(true);
+  EXPECT_TRUE(params_.IsValidTrack("canary-channel"));
   EXPECT_TRUE(params_.IsValidTrack("beta-channel"));
   EXPECT_TRUE(params_.IsValidTrack("dev-channel"));
   EXPECT_FALSE(params_.IsValidTrack("some-channel"));
   EXPECT_FALSE(params_.IsValidTrack(""));
   params_.SetBuildTypeOfficial(false);
+  EXPECT_TRUE(params_.IsValidTrack("canary-channel"));
   EXPECT_TRUE(params_.IsValidTrack("beta-channel"));
   EXPECT_TRUE(params_.IsValidTrack("dev-channel"));
   EXPECT_TRUE(params_.IsValidTrack("some-channel"));