Work around MSE rounding errors in Edge

Edge bug: https://goo.gl/3ZTzse

Issue #1281

Change-Id: I03fcef7d52afc3a15b7cd7c4b873bff774087f82

lib/media/media_source_engine.js

@@ -782,6 +782,13 @@ shaka.media.MediaSourceEngine.prototype.flush_ = function(contentType) {
  */
 shaka.media.MediaSourceEngine.prototype.setTimestampOffset_ =
     function(contentType, timestampOffset) {
+  // Work around for https://github.com/google/shaka-player/issues/1281:
+  // TODO(https://goo.gl/3ZTzse): follow up when this is fixed in Edge
+  if (timestampOffset < 0) {
+    // Try to prevent rounding errors in Edge from removing the first keyframe.
+    timestampOffset += 0.001;
+  }
+
   this.sourceBuffers_[contentType].timestampOffset = timestampOffset;
 
   // Fake 'updateend' event to resolve the operation.

lib/media/streaming_engine.js

@@ -296,10 +296,14 @@ shaka.media.StreamingEngine.MediaState_;
  * The fudge factor for the appendWindowStart.  By adjusting the window
  * backward, we avoid rounding errors that could cause us to remove the keyframe
  * at the start of the Period.
+ *
+ * NOTE: This was increased as part of the solution to
+ * https://github.com/google/shaka-player/issues/1281
+ *
  * @const {number}
  * @private
  */
-shaka.media.StreamingEngine.APPEND_WINDOW_START_FUDGE_ = 0.00001;
+shaka.media.StreamingEngine.APPEND_WINDOW_START_FUDGE_ = 0.1;
 
 
 /** @override */

test/media/streaming_engine_unit.js

@@ -1026,7 +1026,7 @@ describe('StreamingEngine', function() {
     // 20, but reduced by a small fudge factor.
     let lt20 = {
       asymmetricMatch: function(val) {
-        return val > 19.9 && val < 20;
+        return val >= 19.9 && val < 20;
       }
     };
     expect(mediaSourceEngine.setStreamProperties)