Enable Opera testing

tests/html/html.status

Index: tests/html/html.status
===================================================================
--- tests/html/html.status	(revision 10468)
+++ tests/html/html.status	(working copy)
@@ -96,6 +96,37 @@
 svgelement_test: Fail
 svgelement2_test: Fail
 
+[ $runtime == opera ]
+# TODO(kasperl): All of the following failures should be investigated and
+# triaged into bug reports.
+callbacks_test: Fail
+cache_test: Fail
+audiocontext_test: Fail
+blob_constructor_test: Fail
+canvas_using_html_test: Fail
+canvas_test: Fail
+css_test: Fail
+cssstyledeclaration_test: Fail
+element_constructor_1_test: Fail
+exceptions_test: Fail
+element_test: Crash
+indexeddb_1_test: Fail
+indexeddb_3_test: Fail
+indexeddb_4_test: Fail
+mutationobserver_test: Fail
+performance_api_test: Fail
+serialized_script_value_test: Fail
+svg_3_test: Fail
+svgelement_test: Fail
+typed_arrays_1_test: Fail
+typed_arrays_arraybuffer_test: Fail
+websocket_test: Fail
+xhr_test: Fail
+fileapi_test: Skip
+js_interop_3_test: Skip
+js_interop_4_test: Skip
+isolates_test: Skip
+
 [ $runtime == ff ]
 audiocontext_test: Fail      # FF only has Audio element
 css_test: Fail               # No analog to WebKitCSSMatrix
@@ -156,8 +187,6 @@
 *: Skip
 
 # TODO(jmesserly): now that we have a bot, we need to set up Opera testing.
-[ $runtime == opera ]
-*: Skip
 
 [ $compiler == dart2js && $runtime == drt ]
 fileapi_test: Skip # Issue 3022