[CT] Add ability to run unlanded benchmarks on Chromium Perf

ct/go/db/db.go

Index: ct/go/db/db.go
diff --git a/ct/go/db/db.go b/ct/go/db/db.go
index a54a54678c43e8d9559346c7ee6271903932793f..37dc2d50c75ac5c8613d2347c17570597e97c519 100644
--- a/ct/go/db/db.go
+++ b/ct/go/db/db.go
@@ -68,6 +68,7 @@ var v1_up = []string{
 		chromium_patch         TEXT,
 		blink_patch            TEXT,
 		skia_patch             TEXT,
+		benchmark_patch        TEXT,

[dogben, 2015/10/20 15:17:26]

I don't think this is supposed to be here.

[rmistry, 2015/10/20 17:47:48]

Oops. Removed.

 		ts_added               BIGINT       NOT NULL,
 		ts_started             BIGINT,
 		ts_completed           BIGINT,
@@ -249,6 +250,14 @@ var v10_down = []string{
 	`ALTER TABLE ChromiumPerfTasks CONVERT TO CHARACTER SET utf8`,
 }
 
+var v11_up = []string{
+	`ALTER TABLE ChromiumPerfTasks ADD benchmark_patch longtext NOT NULL DEFAULT ""`,
+}
+
+var v11_down = []string{
+	`ALTER TABLE ChromiumPerfTasks DROP benchmark_patch`,
+}
+
 // Define the migration steps.
 // Note: Only add to this list, once a step has landed in version control it
 // must not be changed.
@@ -303,6 +312,11 @@ var migrationSteps = []database.MigrationStep{
 		MySQLUp:   v10_up,
 		MySQLDown: v10_down,
 	},
+	// version 11: Add benchmark_patch column to ChromiumPerfTasks.
+	{
+		MySQLUp:   v11_up,
+		MySQLDown: v11_down,
+	},
 }
 
 // MigrationSteps returns the database migration steps.