Aria details should force spans to be exposed

Bug: 843355
Change-Id: I837d0c38e7ab986a92e256d24703fc2ba088331d
Reviewed-on: https://chromium-review.googlesource.com/1060266
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559220}

content/test/data/accessibility/aria/aria-details-expected-blink.txt

@@ -4,3 +4,14 @@ rootWebArea
 ++paragraph
 ++++staticText name='Details'
 ++++++inlineTextBox name='Details'
+++paragraph
+++++staticText name='This '
+++++++inlineTextBox name='This '
+++++genericContainer detailsId=group
+++++++staticText name='text'
+++++++++inlineTextBox name='text'
+++++staticText name=' has details'
+++++++inlineTextBox name=' has details'
+++group
+++++staticText name='Text details'
+++++++inlineTextBox name='Text details'

content/test/data/accessibility/aria/aria-details-expected-win.txt

@@ -2,4 +2,11 @@ ROLE_SYSTEM_DOCUMENT READONLY FOCUSABLE n_relations=0
 ++IA2_ROLE_SECTION n_relations=0
 ++++ROLE_SYSTEM_TEXT FOCUSABLE n_relations=1
 ++IA2_ROLE_PARAGRAPH n_relations=1
-++++ROLE_SYSTEM_STATICTEXT name='Details' n_relations=0
+++++ROLE_SYSTEM_STATICTEXT name='Details' n_relations=0
\ No newline at end of file
+++IA2_ROLE_PARAGRAPH n_relations=0
+++++ROLE_SYSTEM_STATICTEXT name='This ' n_relations=0
+++++IA2_ROLE_SECTION n_relations=1
+++++++ROLE_SYSTEM_STATICTEXT name='text' n_relations=0
+++++ROLE_SYSTEM_STATICTEXT name=' has details' n_relations=0
+++ROLE_SYSTEM_GROUPING n_relations=1
+++++ROLE_SYSTEM_STATICTEXT name='Text details' n_relations=0

content/test/data/accessibility/aria/aria-details.html

@@ -9,5 +9,8 @@
       <input aria-details="details">
     </div>
     <p id="details">Details</p>
+
+    <p>This <span aria-details="details2">text</span> has details</p>
+    <div role="group" id="details2">Text details</div>
   </body>
 </html>

third_party/blink/renderer/modules/accessibility/ax_layout_object.cc

@@ -697,6 +697,7 @@ bool AXLayoutObject::ComputeAccessibilityIsIgnored(
   // not ignored, rather than just images.
   if (!GetAttribute(aria_helpAttr).IsEmpty() ||
       !GetAttribute(aria_describedbyAttr).IsEmpty() ||
+      !GetAttribute(aria_detailsAttr).IsEmpty() ||
       !GetAttribute(altAttr).IsEmpty() || !GetAttribute(titleAttr).IsEmpty())
     return false;