Bug 1343749. Part 1 - Let MediaTestManager manage timeout of each test. r=jya

MozReview-Commit-ID: HocDk9FCi6Q

--HG--
extra : rebase_source : f88280fc3d11e14275c5d41c5607cb6c77d90da5

dom/media/test/manifest.js

@@ -1612,6 +1612,10 @@ const DEBUG_TEST_LOOP_FOREVER = false;
 //      or end the mochitest if all the tests are done.
 function MediaTestManager() {
 
+  // Set a very large timeout to prevent Mochitest timeout.
+  // Instead MediaTestManager will manage timeout of each test.
+  SimpleTest.requestLongerTimeout(1000);
+
   // Return how many seconds elapsed since |begin|.
   function elapsedTime(begin) {
     var end = new Date();
@@ -1635,6 +1639,7 @@ function MediaTestManager() {
     this.isShutdown = false;
     this.numTestsRunning = 0;
     this.handlers = {};
+    this.timers = {};
 
     // Always wait for explicit finish.
     SimpleTest.waitForExplicitFinish();
@@ -1661,6 +1666,14 @@ function MediaTestManager() {
     this.tokens.push(token);
     this.numTestsRunning++;
     this.handlers[token] = handler;
+
+    var onTimeout = function() {
+      ok(false, `${token} timed out!`);
+      this.finished(token);
+    }.bind(this);
+    // Default timeout to 180s for each test.
+    this.timers[token] = setTimeout(onTimeout, 180000);
+
     is(this.numTestsRunning, this.tokens.length,
        "[started " + token + " t=" + elapsedTime(this.startTime) + "] Length of array should match number of running tests");
   }
@@ -1676,6 +1689,12 @@ function MediaTestManager() {
       this.tokens.splice(i, 1);
     }
 
+    if (this.timers[token]) {
+      // Cancel the timer when the test finishes.
+      clearTimeout(this.timers[token]);
+      this.timers[token] = null;
+    }
+
     info("[finished " + token + "] remaining= " + this.tokens);
     this.numTestsRunning--;
     is(this.numTestsRunning, this.tokens.length,