Make CanPlayType return "probably" for HI10P h264 videos.

media/test/data/test_key_system_instantiation.html

Index: media/test/data/test_key_system_instantiation.html
diff --git a/media/test/data/test_key_system_instantiation.html b/media/test/data/test_key_system_instantiation.html
index 93e48694ebad89c69823b2aca38777e51daba239..489a3dba4ad706a16d3138ba1f03aefbeaa999e2 100644
--- a/media/test/data/test_key_system_instantiation.html
+++ b/media/test/data/test_key_system_instantiation.html
@@ -4,7 +4,14 @@
       // Since promises run asynchronously, use the pages title to keep track
       // of the result.
       function setResultInTitle(title) {
-        document.title = title;
+        if (title == "" || title == "success" ||
+            title == "Unsupported keySystem" ||
+            title == "None of the requested configurations were supported.") {
+          document.title = title;
+        } else {
+          console.log("Result: " + title);
+          document.title = "failure";
+        }
       };
 
       // Compares 2 arrays of MediaKeySystemMediaCapability, comparing only