Adds blimp browser tests to run on Chromium.linux.

BUG=602407

Review-Url: https://codereview.chromium.org/2042873004
Cr-Original-Commit-Position: refs/heads/master@{#398203}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: db7e32cad39ac249f1a016d5c3bd0f4ffef765f6

args/bots/chromium.linux/blimp_linux_dbg.gn

@@ -0,0 +1,4 @@
+import("//build/args/blimp_engine.gn")
+is_debug = true
+use_goma = true
+is_component_build = true