OOPIF support for testRunner.dumpAsText and similar layout dumps.

third_party/WebKit/LayoutTests/canvas/philip/tests/2d.text-custom-font-load-crash.html

Index: third_party/WebKit/LayoutTests/canvas/philip/tests/2d.text-custom-font-load-crash.html
diff --git a/third_party/WebKit/LayoutTests/canvas/philip/tests/2d.text-custom-font-load-crash.html b/third_party/WebKit/LayoutTests/canvas/philip/tests/2d.text-custom-font-load-crash.html
index 2a0984ba734577c63cd774967bfcd17a7bc6c4c1..bf9c5def7b326878ef48fc52b22a2e13d3c1627d 100644
--- a/third_party/WebKit/LayoutTests/canvas/philip/tests/2d.text-custom-font-load-crash.html
+++ b/third_party/WebKit/LayoutTests/canvas/philip/tests/2d.text-custom-font-load-crash.html
@@ -25,6 +25,7 @@ deferTest();
 setTimeout(wrapFunction(function () {
     ctx.fillText('AA', 0, 50);
 
+    _assert(true, "Test passes if it does not crash.")

[dcheng, 2016/01/23 05:17:33]

Not sure if I missed this a comment about this, but what's the reason for this
test change?

[Łukasz Anforowicz, 2016/01/26 00:50:02]

This change is not necessary in the latest patchset - I've removed it.

When testing earlier patchsets I've noted that
LayoutTests/canvas/philip/tests.js:122 should fail a test if the test didn't
call any of the _assertFoo functions.  The modified test did fail with my
earlier changes, without the extra call to _assert.  I don't understand why the
test is passing without my changes and with my latest changes.

     if (window.testRunner)
         testRunner.notifyDone();
 }), 500);