Implement accessibility support for CSS-transformed iframes.

content/browser/accessibility/dump_accessibility_tree_browsertest.cc

Index: content/browser/accessibility/dump_accessibility_tree_browsertest.cc
diff --git a/content/browser/accessibility/dump_accessibility_tree_browsertest.cc b/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
index e43d778396e2153e2eee315e8b21e49506e84cdc..46143bbb7d21536234ecaa3e8ed48afd730f8169 100644
--- a/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
+++ b/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
@@ -848,6 +848,21 @@ IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
   RunHtmlTest(FILE_PATH_LITERAL("iframe-presentational.html"));
 }
 
+IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
+                       AccessibilityIframeTransform) {
+  RunHtmlTest(FILE_PATH_LITERAL("iframe-transform.html"));
+}
+
+IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
+                       AccessibilityIframeTransformCrossProcess) {
+  RunHtmlTest(FILE_PATH_LITERAL("iframe-transform-cross-process.html"));
+}
+
+IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
+                       AccessibilityIframeTransformScrolled) {
+  RunHtmlTest(FILE_PATH_LITERAL("iframe-transform-scrolled.html"));
+}
+
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, AccessibilityImg) {
   RunHtmlTest(FILE_PATH_LITERAL("img.html"));
 }