Add a new role for an iframe element with role=presentation.

Add a new role for an iframe element with role=presentation.

See bug for context; we'd like to make it possible for an author to set
role=presentation on an iframe to make the iframe seamlessly blend into the
AX tree.

BUG=436186
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=186495

[dmazzoni, 2014-12-01 20:03:38]

dmazzoni@chromium.org changed reviewers:
+ aboxhall@chromium.org

[aboxhall, 2014-12-02 16:44:11]

lgtm

[dmazzoni, 2014-12-02 16:54:18]

The CQ bit was checked by dmazzoni@chromium.org

[commit-bot: I haz the power, 2014-12-02 16:55:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/766053006/1

[commit-bot: I haz the power, 2014-12-02 16:55:10]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-12-02 16:55:11]

Failed to apply patch for Source/modules/accessibility/AXObject.h:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file Source/modules/accessibility/AXObject.h
  Hunk #1 FAILED at 95.
  1 out of 1 hunk FAILED -- saving rejects to file
Source/modules/accessibility/AXObject.h.rej

Patch:       Source/modules/accessibility/AXObject.h
Index: Source/modules/accessibility/AXObject.h
diff --git a/Source/modules/accessibility/AXObject.h
b/Source/modules/accessibility/AXObject.h
index
87ef1b0608543edad82a4e2954e3918d87fe14e7..290d6a967419836dcb817cea3c87c2297792d017
100644
--- a/Source/modules/accessibility/AXObject.h
+++ b/Source/modules/accessibility/AXObject.h
@@ -95,6 +95,7 @@ enum AccessibilityRole {
     GrowAreaRole,
     HeadingRole,
     HelpTagRole,
+    IframePresentationalRole,
     IframeRole,
     IgnoredRole,
     ImageMapLinkRole,

[dmazzoni, 2014-12-04 09:12:53]

The CQ bit was checked by dmazzoni@chromium.org

[commit-bot: I haz the power, 2014-12-04 09:13:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/766053006/20001

[commit-bot: I haz the power, 2014-12-04 10:27:04]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=186495