Android Autofill Accessibility, Phase I

content/browser/accessibility/browser_accessibility_manager_android.cc

Index: content/browser/accessibility/browser_accessibility_manager_android.cc
diff --git a/content/browser/accessibility/browser_accessibility_manager_android.cc b/content/browser/accessibility/browser_accessibility_manager_android.cc
index 50238249d9767846b77a602dac1fa37e1159bf59..d2b5e70c60bb5c534dc15aecd57544217682a890 100644
--- a/content/browser/accessibility/browser_accessibility_manager_android.cc
+++ b/content/browser/accessibility/browser_accessibility_manager_android.cc
@@ -10,13 +10,16 @@
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
+#include "base/feature_list.h"
 #include "base/i18n/char_iterator.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
+#include "content/app/strings/grit/content_strings.h"
 #include "content/browser/accessibility/browser_accessibility_android.h"
 #include "content/browser/accessibility/one_shot_accessibility_tree_search.h"
 #include "content/common/accessibility_messages.h"
+#include "content/public/common/content_features.h"
 #include "jni/BrowserAccessibilityManager_jni.h"
 #include "ui/accessibility/ax_text_utils.h"
 
@@ -117,6 +120,22 @@ AccessibilityMatchPredicate PredicateForSearchKey(
   return AllInterestingNodesPredicate;
 }
 
+// The element in the document for which we may be displaying an autofill popup.
+int32_t g_element_hosting_autofill_popup_unique_id = -1;
+
+// Autofill popup will not be part of the |AXTree| that is sent by renderer.
+// Hence, we need a proxy |AXNode| to represent the autofill popup.
+BrowserAccessibility* g_autofill_popup_proxy_node = nullptr;
+ui::AXNode* g_autofill_popup_proxy_node_ax_node = nullptr;
+
+void DeleteAutofillPopupProxy() {
+  if (g_autofill_popup_proxy_node) {
+    g_autofill_popup_proxy_node->Destroy();
+    delete g_autofill_popup_proxy_node_ax_node;
+    g_autofill_popup_proxy_node = nullptr;
+  }
+}
+
 }  // anonymous namespace
 
 namespace aria_strings {
@@ -155,6 +174,9 @@ BrowserAccessibilityManagerAndroid::~BrowserAccessibilityManagerAndroid() {
   if (obj.is_null())
     return;
 
+  // Clean up autofill popup proxy node in case the popup was not dismissed.
+  DeleteAutofillPopupProxy();
+
   Java_BrowserAccessibilityManager_onNativeObjectDestroyed(
       env, obj, reinterpret_cast<intptr_t>(this));
 }
@@ -743,6 +765,14 @@ jint BrowserAccessibilityManagerAndroid::FindElementType(
     jint start_id,
     const JavaParamRef<jstring>& element_type_str,
     jboolean forwards) {
+  // Navigate forwards to the autofill popup's proxy node if focus is currently
+  // on the element hosting the autofill popup. Once within the popup, a back
+  // press will navigate back to the element hosting the popup.
+  if (forwards && start_id == g_element_hosting_autofill_popup_unique_id &&
+      g_autofill_popup_proxy_node) {
+    return g_autofill_popup_proxy_node->unique_id();
+  }
+
   BrowserAccessibilityAndroid* start_node = GetFromUniqueID(start_id);
   if (!start_node)
     return 0;
@@ -918,10 +948,8 @@ void BrowserAccessibilityManagerAndroid::SetAccessibilityFocus(
     const JavaParamRef<jobject>& obj,
     jint id) {
   BrowserAccessibilityAndroid* node = GetFromUniqueID(id);
-  if (!node)
-    return;
-
-  node->manager()->SetAccessibilityFocus(*node);
+  if (node)
+    node->manager()->SetAccessibilityFocus(*node);
 }
 
 bool BrowserAccessibilityManagerAndroid::IsSlider(
@@ -935,6 +963,48 @@ bool BrowserAccessibilityManagerAndroid::IsSlider(
   return node->GetRole() == ui::AX_ROLE_SLIDER;
 }
 
+void BrowserAccessibilityManagerAndroid::OnAutofillPopupDisplayed(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj) {
+  if (!base::FeatureList::IsEnabled(features::kAndroidAutofillAccessibility))
+    return;
+
+  BrowserAccessibility* current_focus = GetFocus();
+  if (current_focus == nullptr) {
+    return;
+  }
+
+  DeleteAutofillPopupProxy();
+
+  g_autofill_popup_proxy_node = BrowserAccessibility::Create();
+  g_autofill_popup_proxy_node_ax_node = new ui::AXNode(nullptr, -1, -1);
+  ui::AXNodeData ax_node_data;
+  ax_node_data.role = ui::AX_ROLE_MENU;
+  ax_node_data.SetName("Autofill");
+  ax_node_data.state = 1 << ui::AX_STATE_READ_ONLY;
+  ax_node_data.state |= 1 << ui::AX_STATE_FOCUSABLE;
+  ax_node_data.state |= 1 << ui::AX_STATE_SELECTABLE;
+  g_autofill_popup_proxy_node_ax_node->SetData(ax_node_data);
+  g_autofill_popup_proxy_node->Init(this, g_autofill_popup_proxy_node_ax_node);
+
+  g_element_hosting_autofill_popup_unique_id = current_focus->unique_id();
+}
+
+void BrowserAccessibilityManagerAndroid::OnAutofillPopupDismissed(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj) {
+  g_element_hosting_autofill_popup_unique_id = -1;
+  DeleteAutofillPopupProxy();
+}
+
+jboolean BrowserAccessibilityManagerAndroid::IsAutofillPopupNode(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj,
+    jint id) {
+  return g_autofill_popup_proxy_node &&
+         g_autofill_popup_proxy_node->unique_id() == id;
+}
+
 bool BrowserAccessibilityManagerAndroid::Scroll(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj,