Add chromiumos_preflight build target

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 1cad2baa0886339eb88db97debd69c97a031cc39..762096a7b1739c93a5664def9e382c781039284e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -95,19 +95,15 @@ if (is_chromeos) {
       "//breakpad:minidump_stackwalk($host_toolchain)",
       "//chrome",
       "//chrome/test/chromedriver",
-
-      # TODO(crbug.com/607362)
-      # "//content/test:video_decode_accelerator_unittest",
-      # "//content/test:video_encode_accelerator_unittest",
-
+      "//content/test:video_decode_accelerator_unittest",
+      "//content/test:video_encode_accelerator_unittest",
       "//media:media_unittests",
       "//ppapi/examples/video_decode",
       "//sandbox/linux:chrome_sandbox",
       "//sandbox/linux:sandbox_linux_unittests",
 
-      # TODO(crbug.com/607362)
+      # Blocked on https://github.com/catapult-project/catapult/issues/2297
       #"//third_party/catapult/telemetry:bitmaptools",
-
       "//tools/perf/clear_system_cache",
     ]
   }