Add ability to only upload a single Chromium build and check for patch existence

ct/go/master_scripts/build_chromium/main.go

Index: ct/go/master_scripts/build_chromium/main.go
diff --git a/ct/go/master_scripts/build_chromium/main.go b/ct/go/master_scripts/build_chromium/main.go
index 48e484f663c6bfb9e80703d5bc26fa77a925e33d..692d62b97fe583b06f21bb187ac1f2da83ecfa21 100644
--- a/ct/go/master_scripts/build_chromium/main.go
+++ b/ct/go/master_scripts/build_chromium/main.go
@@ -90,7 +90,7 @@ func main() {
 		return
 	}
 
-	if _, _, err := util.CreateChromiumBuild("", *targetPlatform, *chromiumHash, *skiaHash, *applyPatches); err != nil {
+	if _, _, err := util.CreateChromiumBuild("", *targetPlatform, *chromiumHash, *skiaHash, *applyPatches, true); err != nil {
 		glog.Errorf("Error while creating the Chromium build: %s", err)
 		return
 	}