UI: Add query table, omnibox search and progress bar

This CL adds the initial ability to perform arbitrary
SQL queries using the UI and adds a progress bar to the
omnibox. The UI is still very rough but it's a starting
point.

Change-Id: Iabc8520403169459f70676d30315100441db4e8d
diff --git a/ui/src/common/state.ts b/ui/src/common/state.ts
index 89c10cb..05323c1 100644
--- a/ui/src/common/state.ts
+++ b/ui/src/common/state.ts
@@ -31,6 +31,7 @@
 
 export interface EngineConfig {
   id: string;
+  ready: boolean;
   source: string|File;
 }