Converts accNavigate over to the AXPlatformNode code.

ui/accessibility/platform/ax_platform_node_win.cc

Index: ui/accessibility/platform/ax_platform_node_win.cc
diff --git a/ui/accessibility/platform/ax_platform_node_win.cc b/ui/accessibility/platform/ax_platform_node_win.cc
index 295a404af706d24c7b75645fc0b09881e2db1a4b..b29c62fb1ac84bcfb55b1b1465207950c7581f15 100644
--- a/ui/accessibility/platform/ax_platform_node_win.cc
+++ b/ui/accessibility/platform/ax_platform_node_win.cc
@@ -20,6 +20,7 @@
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/accessibility/ax_action_data.h"
 #include "ui/accessibility/ax_node_data.h"
+#include "ui/accessibility/ax_role_properties.h"
 #include "ui/accessibility/ax_text_utils.h"
 #include "ui/accessibility/ax_tree_data.h"
 #include "ui/accessibility/platform/ax_platform_node_delegate.h"
@@ -361,12 +362,6 @@ STDMETHODIMP AXPlatformNodeWin::accNavigate(
 
   IAccessible* result = nullptr;
   switch (nav_dir) {
-    case NAVDIR_DOWN:
-    case NAVDIR_UP:
-    case NAVDIR_LEFT:
-    case NAVDIR_RIGHT:
-      // These directions are not implemented except in tables.
-      return E_NOTIMPL;
 
     case NAVDIR_FIRSTCHILD:
       if (delegate_->GetChildCount() > 0)
@@ -391,6 +386,67 @@ STDMETHODIMP AXPlatformNodeWin::accNavigate(
         result = previous->GetNativeViewAccessible();
       break;
     }
+
+    case NAVDIR_DOWN: {
+      // This direction is not implemented except in tables.
+      if (!ui::IsTableLikeRole(GetData().role) &&
+          !ui::IsCellOrTableHeaderRole(GetData().role))
+        return E_NOTIMPL;
+
+      AXPlatformNodeBase* next = target->GetTableCell(
+          GetTableRow() + GetTableRowSpan(), GetTableColumn());
+      if (!next)
+        return S_OK;
+
+      result = next->GetNativeViewAccessible();
+      break;
+    }
+
+    case NAVDIR_UP: {
+      // This direction is not implemented except in tables.
+      if (!ui::IsTableLikeRole(GetData().role) &&
+          !ui::IsCellOrTableHeaderRole(GetData().role))
+        return E_NOTIMPL;
+
+      AXPlatformNodeBase* next =
+          target->GetTableCell(GetTableRow() - 1, GetTableColumn());
+      if (!next)
+        return S_OK;
+
+      result = next->GetNativeViewAccessible();
+      break;
+    }
+
+    case NAVDIR_LEFT: {
+      // This direction is not implemented except in tables.
+      if (!ui::IsTableLikeRole(GetData().role) &&
+          !ui::IsCellOrTableHeaderRole(GetData().role))
+        return E_NOTIMPL;
+
+      AXPlatformNodeBase* next =
+          target->GetTableCell(GetTableRow(), GetTableColumn() - 1);
+      if (!next)
+        return S_OK;
+
+      result = next->GetNativeViewAccessible();
+      break;
+    }
+
+    case NAVDIR_RIGHT: {
+      // This direction is not implemented except in tables.
+
+      if (!ui::IsTableLikeRole(GetData().role) &&
+          !ui::IsCellOrTableHeaderRole(GetData().role))
+        return E_NOTIMPL;
+
+      AXPlatformNodeBase* next = target->GetTableCell(
+          GetTableRow(), GetTableColumn() + GetTableColumnSpan());
+      if (!next)
+        return S_OK;
+
+      result = next->GetNativeViewAccessible();
+      break;
+    }
   }
 
   if (!result)