Bug 1249860 - Add simulcast test for resolution scaling. r=bwc

MozReview-Commit-ID: LU7gUD0ycKw

--HG--
extra : rebase_source : 440a32195520271197229775b4c27e6b3c38861d

dom/media/tests/mochitest/test_peerConnection_simulcastOffer.html

@@ -83,7 +83,7 @@
           sender.setParameters({
             encodings: [
             { rid: "foo", maxBitrate: 40000 },
-            { rid: "bar", maxBitrate: 40000 },
+            { rid: "bar", maxBitrate: 40000, scaleResolutionDownBy: 2 },
             ]
           });
         }
@@ -113,6 +113,16 @@
           ok(vremote, "Should have remote video element for pcRemote");
           return waitForColorChange(helper, vremote);
         },
+        function PC_REMOTE_CHECK_SIZE_1() {
+          var vlocal = document.getElementById('pcLocal_local1_video');
+          var vremote = document.getElementById('pcRemote_remote1_video');
+          ok(vlocal, "Should have local video element for pcLocal");
+          ok(vremote, "Should have remote video element for pcRemote");
+          ok(vlocal.videoWidth > 0, "source width is positive");
+          ok(vlocal.videoHeight > 0, "source height is positive");
+          is(vremote.videoWidth, vlocal.videoWidth, "sink is same width as source");
+          is(vremote.videoHeight, vlocal.videoHeight, "sink is same height as source");
+        },
         function PC_REMOTE_SET_RTP_SECOND_RID(test) {
           // Now, cause pcRemote to filter out everything but the second SSRC.
           // This lets only the other simulcast stream through.
@@ -126,6 +136,16 @@
           ok(vremote, "Should have remote video element for pcRemote");
           return waitForColorChange(helper, vremote);
         },
+        function PC_REMOTE_CHECK_SIZE_2() {
+          var vlocal = document.getElementById('pcLocal_local1_video');
+          var vremote = document.getElementById('pcRemote_remote1_video');
+          ok(vlocal, "Should have local video element for pcLocal");
+          ok(vremote, "Should have remote video element for pcRemote");
+          ok(vlocal.videoWidth > 0, "source width is positive");
+          ok(vlocal.videoHeight > 0, "source height is positive");
+          is(vremote.videoWidth, vlocal.videoWidth / 2, "sink is 1/2 width of source");
+          is(vremote.videoHeight, vlocal.videoHeight / 2,  "sink is 1/2 height of source");
+        },
         function PC_REMOTE_SET_RTP_NONEXISTENT_RID(test) {
           // Now, cause pcRemote to filter out everything, just to make sure
           // selectRecvSsrc is working.