Add LogDog log stream fetcher code.

web/inc/rpc/client.ts

 /*
   Copyright 2016 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 */
 
 ///<reference path="../luci-sleep-promise/promise.ts" />
 
 namespace luci {
   /**
@@ skipping 198 matching lines @@
 
   /**
    * RetryIterator configuration class.
    *
    * A user will define the retry parameters using a Retry instance, then create
    * a RetryIterator with them.
    */
   export type Retry = {
     // The number of retries to perform before failing. If undefined, will retry
     // indefinitely.
-    retries: number | undefined;
+    retries?: number;
 
     // The amount of time to delay in between retry attempts, in milliseconds.
     // If undefined or < 0, no delay will be imposed.
     delay: number;
     // The maximum delay to apply, in milliseconds. If > 0 and delay scales past
     // "maxDelay", it will be capped at "maxDelay".
-    maxDelay: number | undefined;
+    maxDelay?: number;
 
     // delayScaling is the multiplier applied to "delay" in between retries. If
     // undefined or <= 1, DEFAULT_DELAY_SCALING will be used.
     delayScaling?: number;
   };
 
   /**
    * Generic exponential backoff retry delay generator.
    *
    * A RetryIterator is a specific configured instance of a Retry. Each call to
@@ skipping 35 matching lines @@
 
       let delay = this.delay;
       this.delay *= this.delayScaling;
       if (this.maxDelay > 0 && delay > this.maxDelay) {
         this.delay = delay = this.maxDelay;
       }
       return delay;
     }
   }
 }