Implement accessibility support for CSS-transformed iframes.

content/browser/accessibility/accessibility_tree_formatter_blink.cc

Index: content/browser/accessibility/accessibility_tree_formatter_blink.cc
diff --git a/content/browser/accessibility/accessibility_tree_formatter_blink.cc b/content/browser/accessibility/accessibility_tree_formatter_blink.cc
index 200c3375f45d6f7cf07d273543d3e1629106d329..777e1ce28d6ba524a9270bb1eded15cb827cc683 100644
--- a/content/browser/accessibility/accessibility_tree_formatter_blink.cc
+++ b/content/browser/accessibility/accessibility_tree_formatter_blink.cc
@@ -41,10 +41,20 @@ void AccessibilityTreeFormatterBlink::AddProperties(
 
   dict->SetString("role", ui::ToString(node.GetData().role));
 
-  dict->SetInteger("boundsX", node.GetData().location.x());
-  dict->SetInteger("boundsY", node.GetData().location.y());
-  dict->SetInteger("boundsWidth", node.GetData().location.width());
-  dict->SetInteger("boundsHeight", node.GetData().location.height());
+  gfx::Rect bounds = node.GetData().location;
+  dict->SetInteger("boundsX", bounds.x());
+  dict->SetInteger("boundsY", bounds.y());
+  dict->SetInteger("boundsWidth", bounds.width());
+  dict->SetInteger("boundsHeight", bounds.height());
+
+  gfx::Rect page_bounds = node.GetLocalBoundsRect();
+  dict->SetInteger("pageBoundsX", page_bounds.x());
+  dict->SetInteger("pageBoundsY", page_bounds.y());
+  dict->SetInteger("pageBoundsWidth", page_bounds.width());
+  dict->SetInteger("pageBoundsHeight", page_bounds.height());
+
+  dict->SetBoolean("transform",
+                   !node.GetData().transform.IsIdentity());
 
   for (int state_index = ui::AX_STATE_NONE;
        state_index <= ui::AX_STATE_LAST;
@@ -133,6 +143,19 @@ base::string16 AccessibilityTreeFormatterBlink::ToString(
                  FormatCoordinates("size", "boundsWidth", "boundsHeight", dict),
                  &line);
 
+  WriteAttribute(false,
+                 FormatCoordinates("pageLocation",
+                                   "pageBoundsX", "pageBoundsY", dict),
+                 &line);
+  WriteAttribute(false,
+                 FormatCoordinates("pageSize",
+                                   "pageBoundsWidth", "pageBoundsHeight", dict),
+                 &line);
+
+  bool transform;
+  if (dict.GetBoolean("transform", &transform) && transform)
+    WriteAttribute(false, "transform", &line);
+
   for (int attr_index = ui::AX_STRING_ATTRIBUTE_NONE;
        attr_index <= ui::AX_STRING_ATTRIBUTE_LAST;
        ++attr_index) {