Add problematic wpt/media-source tests to TestExpectations.

third_party/WebKit/LayoutTests/TestExpectations

Index: third_party/WebKit/LayoutTests/TestExpectations
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index 2016a4aa6f7b02fcd5e9f97884e6655c8cafa074..7b50fe9350c2caea89b396adf468fc12e26d9383 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -2555,8 +2555,10 @@ crbug.com/713587 external/wpt/css/css-ui-3/caret-color-006.html [ Skip ]
 crbug.com/626703 external/wpt/css/css-grid-1/alignment/grid-content-distribution-with-collapsed-tracks-001.html [ Failure ]
 crbug.com/626703 external/wpt/css/css-grid-1/alignment/grid-content-distribution-with-collapsed-tracks-002.html [ Failure ]
 crbug.com/626703 external/wpt/css/css-grid-1/alignment/grid-content-distribution-with-collapsed-tracks-003.html [ Failure ]
-crbug.com/626703 [ Android Linux Mac10.11 Mac10.12 Retina Win ] external/wpt/media-source/mediasource-avtracks.html [ Crash ]
-crbug.com/626703 external/wpt/media-source/mediasource-getvideoplaybackquality.html [ Timeout ]
+crbug.com/626703 external/wpt/media-source/mediasource-appendbuffer-quota-exceeded.html [ Timeout ]
+crbug.com/626703 external/wpt/media-source/mediasource-avtracks.html [ Crash ]
+crbug.com/626703 external/wpt/media-source/mediasource-duration.html [ Failure ]
+crbug.com/626703 external/wpt/media-source/mediasource-getvideoplaybackquality.html [ Timeout Failure ]
 crbug.com/626703 external/wpt/compat/webkit-text-fill-color-property-005.html [ Failure ]
 crbug.com/626703 external/wpt/console/console-count-logging-manual.html [ Skip ]
 crbug.com/626703 external/wpt/notifications/body-basic-manual.html [ Skip ]