Revert of Implement NativeViewAccessibilityWin using AXPlatformNodeWin.

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
deleted file mode 100644
index acc2a2b69f70adb1067266b229c9f324d333cd15..0000000000000000000000000000000000000000
--- a/ui/accessibility/platform/ax_platform_node_win.cc
+++ /dev/null
@@ -1,983 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <atlbase.h>
-#include <atlcom.h>
-#include <oleacc.h>
-
-#include "base/containers/hash_tables.h"
-#include "base/lazy_instance.h"
-#include "base/win/scoped_comptr.h"
-#include "base/win/scoped_variant.h"
-#include "third_party/iaccessible2/ia2_api_all.h"
-#include "ui/accessibility/ax_node_data.h"
-#include "ui/accessibility/ax_text_utils.h"
-#include "ui/accessibility/platform/ax_platform_node_delegate.h"
-#include "ui/accessibility/platform/ax_platform_node_win.h"
-#include "ui/base/win/atl_module.h"
-
-//
-// Macros to use at the top of any AXPlatformNodeWin function that implements
-// a COM interface. Because COM objects are reference counted and clients
-// are completely untrusted, it's important to always first check that our
-// object is still valid, and then check that all pointer arguments are
-// not NULL.
-//
-
-#define COM_OBJECT_VALIDATE() \
-    if (!delegate_) \
-      return E_FAIL;
-#define COM_OBJECT_VALIDATE_1_ARG(arg) \
-    if (!delegate_) return E_FAIL; \
-    if (!arg) return E_INVALIDARG
-#define COM_OBJECT_VALIDATE_2_ARGS(arg1, arg2) \
-    if (!delegate_) return E_FAIL; \
-    if (!arg1) return E_INVALIDARG; \
-    if (!arg2) return E_INVALIDARG
-#define COM_OBJECT_VALIDATE_3_ARGS(arg1, arg2, arg3) \
-    if (!delegate_) return E_FAIL; \
-    if (!arg1) return E_INVALIDARG; \
-    if (!arg2) return E_INVALIDARG; \
-    if (!arg3) return E_INVALIDARG
-#define COM_OBJECT_VALIDATE_4_ARGS(arg1, arg2, arg3, arg4) \
-    if (!delegate_) return E_FAIL; \
-    if (!arg1) return E_INVALIDARG; \
-    if (!arg2) return E_INVALIDARG; \
-    if (!arg3) return E_INVALIDARG; \
-    if (!arg4) return E_INVALIDARG
-#define COM_OBJECT_VALIDATE_VAR_ID(var_id) \
-    if (!delegate_) return E_FAIL; \
-    if (!IsValidId(var_id)) return E_INVALIDARG
-#define COM_OBJECT_VALIDATE_VAR_ID_1_ARG(var_id, arg) \
-    if (!delegate_) return E_FAIL; \
-    if (!IsValidId(var_id)) return E_INVALIDARG; \
-    if (!arg) return E_INVALIDARG
-#define COM_OBJECT_VALIDATE_VAR_ID_2_ARGS(var_id, arg1, arg2) \
-    if (!delegate_) return E_FAIL; \
-    if (!IsValidId(var_id)) return E_INVALIDARG; \
-    if (!arg1) return E_INVALIDARG; \
-    if (!arg2) return E_INVALIDARG
-#define COM_OBJECT_VALIDATE_VAR_ID_3_ARGS(var_id, arg1, arg2, arg3) \
-    if (!delegate_) return E_FAIL; \
-    if (!IsValidId(var_id)) return E_INVALIDARG; \
-    if (!arg1) return E_INVALIDARG; \
-    if (!arg2) return E_INVALIDARG; \
-    if (!arg3) return E_INVALIDARG
-#define COM_OBJECT_VALIDATE_VAR_ID_4_ARGS(var_id, arg1, arg2, arg3, arg4) \
-    if (!delegate_) return E_FAIL; \
-    if (!IsValidId(var_id)) return E_INVALIDARG; \
-    if (!arg1) return E_INVALIDARG; \
-    if (!arg2) return E_INVALIDARG; \
-    if (!arg3) return E_INVALIDARG; \
-    if (!arg4) return E_INVALIDARG
-
-namespace ui {
-
-namespace {
-
-typedef base::hash_map<LONG, AXPlatformNodeWin*> UniqueIdWinMap;
-// Map from each AXPlatformNodeWin's unique id to its instance.
-base::LazyInstance<UniqueIdWinMap> g_unique_id_win_map =
-    LAZY_INSTANCE_INITIALIZER;
-
-typedef base::hash_set<AXPlatformNodeWin*> AXPlatformNodeWinSet;
-// Set of all AXPlatformNodeWin objects that were the target of an
-// alert event.
-base::LazyInstance<AXPlatformNodeWinSet> g_alert_targets =
-    LAZY_INSTANCE_INITIALIZER;
-
-LONG GetNextNegativeUniqueIdForWinAccessibility(AXPlatformNodeWin* obj) {
-  static LONG next_unique_id = -1;
-  LONG unique_id = next_unique_id;
-  if (next_unique_id == LONG_MIN)
-    next_unique_id = -1;
-  else
-    next_unique_id--;
-
-  g_unique_id_win_map.Get().insert(std::make_pair(unique_id, obj));
-
-  return unique_id;
-}
-
-void UnregisterNegativeUniqueId(LONG unique_id) {
-  g_unique_id_win_map.Get().erase(unique_id);
-}
-
-}  // namespace
-
-// static
-AXPlatformNode* AXPlatformNode::Create(AXPlatformNodeDelegate* delegate) {
-  // Make sure ATL is initialized in this module.
-  ui::win::CreateATLModuleIfNeeded();
-
-  CComObject<AXPlatformNodeWin>* instance = nullptr;
-  HRESULT hr = CComObject<AXPlatformNodeWin>::CreateInstance(&instance);
-  DCHECK(SUCCEEDED(hr));
-  instance->Init(delegate);
-  instance->AddRef();
-  return instance;
-}
-
-// static
-AXPlatformNode* AXPlatformNode::FromNativeViewAccessible(
-    gfx::NativeViewAccessible accessible) {
-  base::win::ScopedComPtr<AXPlatformNodeWin> ax_platform_node;
-  accessible->QueryInterface(ax_platform_node.Receive());
-  return ax_platform_node.get();
-}
-
-AXPlatformNodeWin::AXPlatformNodeWin()
-    : unique_id_win_(GetNextNegativeUniqueIdForWinAccessibility(this)) {
-}
-
-AXPlatformNodeWin::~AXPlatformNodeWin() {
-  CHECK(!delegate_);
-}
-
-//
-// AXPlatformNode implementation.
-//
-
-void AXPlatformNodeWin::Destroy() {
-  delegate_ = nullptr;
-  UnregisterNegativeUniqueId(unique_id_win_);
-  RemoveAlertTarget();
-  Release();
-}
-
-gfx::NativeViewAccessible AXPlatformNodeWin::GetNativeViewAccessible() {
-  return this;
-}
-
-void AXPlatformNodeWin::NotifyAccessibilityEvent(ui::AXEvent event_type) {
-  HWND hwnd = delegate_->GetTargetForNativeAccessibilityEvent();
-  if (!hwnd)
-    return;
-
-  int native_event = MSAAEvent(event_type);
-  if (native_event < EVENT_MIN)
-    return;
-
-  ::NotifyWinEvent(native_event, hwnd, OBJID_CLIENT, unique_id_win_);
-
-  // Keep track of objects that are a target of an alert event.
-  if (event_type == ui::AX_EVENT_ALERT)
-    AddAlertTarget();
-}
-
-int AXPlatformNodeWin::GetIndexInParent() {
-  base::win::ScopedComPtr<IDispatch> parent_dispatch;
-  base::win::ScopedComPtr<IAccessible> parent_accessible;
-  if (S_OK != get_accParent(parent_dispatch.Receive()))
-    return -1;
-  if (S_OK != parent_dispatch.QueryInterface(parent_accessible.Receive()))
-    return -1;
-
-  LONG child_count = 0;
-  if (S_OK != parent_accessible->get_accChildCount(&child_count))
-    return -1;
-  for (LONG index = 1; index <= child_count; ++index) {
-    base::win::ScopedVariant childid_index(index);
-    base::win::ScopedComPtr<IDispatch> child_dispatch;
-    base::win::ScopedComPtr<IAccessible> child_accessible;
-    if (S_OK == parent_accessible->get_accChild(childid_index,
-                                                child_dispatch.Receive()) &&
-        S_OK == child_dispatch.QueryInterface(child_accessible.Receive())) {
-      if (child_accessible.get() == this)
-        return index - 1;
-    }
-  }
-
-  return -1;
-}
-
-//
-// IAccessible implementation.
-//
-
-STDMETHODIMP AXPlatformNodeWin::accHitTest(
-    LONG x_left, LONG y_top, VARIANT* child) {
-  COM_OBJECT_VALIDATE_1_ARG(child);
-  gfx::NativeViewAccessible hit_child = delegate_->HitTestSync(x_left, y_top);
-  if (!hit_child) {
-    child->vt = VT_EMPTY;
-    return S_FALSE;
-  }
-
-  if (hit_child == this) {
-    // This object is the best match, so return CHILDID_SELF. It's tempting to
-    // simplify the logic and use VT_DISPATCH everywhere, but the Windows
-    // call AccessibleObjectFromPoint will keep calling accHitTest until some
-    // object returns CHILDID_SELF.
-    child->vt = VT_I4;
-    child->lVal = CHILDID_SELF;
-    return S_OK;
-  }
-
-  // Call accHitTest recursively on the result, which may be a recursive call
-  // to this function or it may be overridden, for example in the case of a
-  // WebView.
-  HRESULT result = hit_child->accHitTest(x_left, y_top, child);
-
-  // If the recursive call returned CHILDID_SELF, we have to convert that
-  // into a VT_DISPATCH for the return value to this call.
-  if (S_OK == result && child->vt == VT_I4 && child->lVal == CHILDID_SELF) {
-    child->vt = VT_DISPATCH;
-    child->pdispVal = hit_child;
-    // Always increment ref when returning a reference to a COM object.
-    child->pdispVal->AddRef();
-  }
-  return result;
-}
-
-HRESULT AXPlatformNodeWin::accDoDefaultAction(VARIANT var_id) {
-  COM_OBJECT_VALIDATE_VAR_ID(var_id);
-  delegate_->DoDefaultAction();
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::accLocation(
-    LONG* x_left, LONG* y_top, LONG* width, LONG* height, VARIANT var_id) {
-  COM_OBJECT_VALIDATE_VAR_ID_4_ARGS(var_id, x_left, y_top, width, height);
-  gfx::Rect bounds = GetData().location;
-  bounds += delegate_->GetGlobalCoordinateOffset();
-  *x_left = bounds.x();
-  *y_top  = bounds.y();
-  *width  = bounds.width();
-  *height = bounds.height();
-
-  if (bounds.IsEmpty())
-    return S_FALSE;
-
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::accNavigate(
-    LONG nav_dir, VARIANT start, VARIANT* end) {
-  COM_OBJECT_VALIDATE_VAR_ID_1_ARG(start, end);
-  IAccessible* result = nullptr;
-
-  switch (nav_dir) {
-    case NAVDIR_DOWN:
-    case NAVDIR_UP:
-    case NAVDIR_LEFT:
-    case NAVDIR_RIGHT:
-      // These directions are not implemented, matching Mozilla and IE.
-      return E_NOTIMPL;
-
-    case NAVDIR_FIRSTCHILD:
-      if (delegate_->GetChildCount() > 0)
-        result = delegate_->ChildAtIndex(0);
-      break;
-
-    case NAVDIR_LASTCHILD:
-      if (delegate_->GetChildCount() > 0)
-        result = delegate_->ChildAtIndex(delegate_->GetChildCount() - 1);
-      break;
-
-    case NAVDIR_NEXT: {
-      AXPlatformNodeBase* next = GetNextSibling();
-      if (next)
-        result = next->GetNativeViewAccessible();
-      break;
-    }
-
-    case NAVDIR_PREVIOUS: {
-      AXPlatformNodeBase* previous = GetPreviousSibling();
-      if (previous)
-        result = previous->GetNativeViewAccessible();
-      break;
-    }
-
-    default:
-      return E_INVALIDARG;
-  }
-
-  if (!result) {
-    end->vt = VT_EMPTY;
-    return S_FALSE;
-  }
-
-  end->vt = VT_DISPATCH;
-  end->pdispVal = result;
-  // Always increment ref when returning a reference to a COM object.
-  end->pdispVal->AddRef();
-
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accChild(VARIANT var_child,
-                                             IDispatch** disp_child) {
-  COM_OBJECT_VALIDATE_1_ARG(disp_child);
-  LONG child_id = V_I4(&var_child);
-  if (child_id == CHILDID_SELF) {
-    *disp_child = this;
-    (*disp_child)->AddRef();
-    return S_OK;
-  }
-
-  if (child_id >= 1 && child_id <= delegate_->GetChildCount()) {
-    // Positive child ids are a 1-based child index, used by clients
-    // that want to enumerate all immediate children.
-    *disp_child = delegate_->ChildAtIndex(child_id - 1);
-    (*disp_child)->AddRef();
-    return S_OK;
-  }
-
-  if (child_id >= 0)
-    return E_FAIL;
-
-  // Negative child ids can be used to map to any descendant.
-  UniqueIdWinMap* unique_ids = g_unique_id_win_map.Pointer();
-  auto iter = unique_ids->find(child_id);
-  if (iter != unique_ids->end()) {
-    *disp_child = iter->second;
-    (*disp_child)->AddRef();
-    return S_OK;
-  }
-
-  *disp_child = nullptr;
-  return E_FAIL;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accChildCount(LONG* child_count) {
-  COM_OBJECT_VALIDATE_1_ARG(child_count);
-  *child_count = delegate_->GetChildCount();
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accDefaultAction(
-    VARIANT var_id, BSTR* def_action) {
-  COM_OBJECT_VALIDATE_VAR_ID_1_ARG(var_id, def_action);
-  return GetStringAttributeAsBstr(ui::AX_ATTR_ACTION, def_action);
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accDescription(
-    VARIANT var_id, BSTR* desc) {
-  COM_OBJECT_VALIDATE_VAR_ID_1_ARG(var_id, desc);
-  return GetStringAttributeAsBstr(ui::AX_ATTR_DESCRIPTION, desc);
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accFocus(VARIANT* focus_child) {
-  COM_OBJECT_VALIDATE_1_ARG(focus_child);
-  gfx::NativeViewAccessible focus_accessible = delegate_->GetFocus();
-  if (focus_accessible == this) {
-    focus_child->vt = VT_I4;
-    focus_child->lVal = CHILDID_SELF;
-  } else if (focus_accessible) {
-    focus_child->vt = VT_DISPATCH;
-    focus_child->pdispVal = focus_accessible;
-    focus_child->pdispVal->AddRef();
-    return S_OK;
-  } else {
-    focus_child->vt = VT_EMPTY;
-  }
-
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accKeyboardShortcut(
-    VARIANT var_id, BSTR* acc_key) {
-  COM_OBJECT_VALIDATE_VAR_ID_1_ARG(var_id, acc_key);
-  return GetStringAttributeAsBstr(ui::AX_ATTR_SHORTCUT, acc_key);
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accName(
-    VARIANT var_id, BSTR* name) {
-  COM_OBJECT_VALIDATE_VAR_ID_1_ARG(var_id, name);
-  return GetStringAttributeAsBstr(ui::AX_ATTR_NAME, name);
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accParent(
-    IDispatch** disp_parent) {
-  COM_OBJECT_VALIDATE_1_ARG(disp_parent);
-  *disp_parent = GetParent();
-  if (*disp_parent) {
-    (*disp_parent)->AddRef();
-    return S_OK;
-  }
-
-  return S_FALSE;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accRole(
-    VARIANT var_id, VARIANT* role) {
-  COM_OBJECT_VALIDATE_VAR_ID_1_ARG(var_id, role);
-  role->vt = VT_I4;
-  role->lVal = MSAARole();
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accState(
-    VARIANT var_id, VARIANT* state) {
-  COM_OBJECT_VALIDATE_VAR_ID_1_ARG(var_id, state);
-  state->vt = VT_I4;
-  state->lVal = MSAAState();
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accHelp(
-    VARIANT var_id, BSTR* help) {
-  COM_OBJECT_VALIDATE_VAR_ID_1_ARG(var_id, help);
-  return GetStringAttributeAsBstr(ui::AX_ATTR_HELP, help);
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accValue(VARIANT var_id, BSTR* value) {
-  COM_OBJECT_VALIDATE_VAR_ID_1_ARG(var_id, value);
-  return GetStringAttributeAsBstr(ui::AX_ATTR_VALUE, value);
-}
-
-STDMETHODIMP AXPlatformNodeWin::put_accValue(VARIANT var_id,
-                                             BSTR new_value) {
-  COM_OBJECT_VALIDATE_VAR_ID(var_id);
-  if (delegate_->SetStringValue(new_value))
-    return S_OK;
-  return E_FAIL;
-}
-
-// IAccessible functions not supported.
-
-STDMETHODIMP AXPlatformNodeWin::get_accSelection(VARIANT* selected) {
-  COM_OBJECT_VALIDATE_1_ARG(selected);
-  if (selected)
-    selected->vt = VT_EMPTY;
-  return E_NOTIMPL;
-}
-
-STDMETHODIMP AXPlatformNodeWin::accSelect(
-    LONG flagsSelect, VARIANT var_id) {
-  COM_OBJECT_VALIDATE_VAR_ID(var_id);
-  return E_NOTIMPL;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_accHelpTopic(
-    BSTR* help_file, VARIANT var_id, LONG* topic_id) {
-  COM_OBJECT_VALIDATE_VAR_ID_2_ARGS(var_id, help_file, topic_id);
-  if (help_file) {
-    *help_file = nullptr;
-  }
-  if (topic_id) {
-    *topic_id = static_cast<LONG>(-1);
-  }
-  return E_NOTIMPL;
-}
-
-STDMETHODIMP AXPlatformNodeWin::put_accName(
-    VARIANT var_id, BSTR put_name) {
-  COM_OBJECT_VALIDATE_VAR_ID(var_id);
-  // Deprecated.
-  return E_NOTIMPL;
-}
-
-//
-// IAccessible2 implementation.
-//
-
-STDMETHODIMP AXPlatformNodeWin::role(LONG* role) {
-  COM_OBJECT_VALIDATE_1_ARG(role);
-  *role = MSAARole();
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_states(AccessibleStates* states) {
-  COM_OBJECT_VALIDATE_1_ARG(states);
-  // There are only a couple of states we need to support
-  // in IAccessible2. If any more are added, we may want to
-  // add a helper function like MSAAState.
-  *states = IA2_STATE_OPAQUE;
-  if (GetData().state & (1 << ui::AX_STATE_EDITABLE))
-    *states |= IA2_STATE_EDITABLE;
-
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_uniqueID(LONG* unique_id) {
-  COM_OBJECT_VALIDATE_1_ARG(unique_id);
-  *unique_id = unique_id_win_;
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_windowHandle(HWND* window_handle) {
-  COM_OBJECT_VALIDATE_1_ARG(window_handle);
-  *window_handle = delegate_->GetTargetForNativeAccessibilityEvent();
-  return *window_handle ? S_OK : S_FALSE;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_relationTargetsOfType(
-    BSTR type_bstr,
-    long max_targets,
-    IUnknown ***targets,
-    long *n_targets) {
-  COM_OBJECT_VALIDATE_2_ARGS(targets, n_targets);
-
-  *n_targets = 0;
-  *targets = nullptr;
-
-  // Only respond to requests for relations of type "alerts".
-  base::string16 type(type_bstr);
-  if (type != L"alerts")
-    return S_FALSE;
-
-  // Collect all of the objects that have had an alert fired on them that
-  // are a descendant of this object.
-  std::vector<AXPlatformNodeWin*> alert_targets;
-  for (auto iter = g_alert_targets.Get().begin();
-       iter != g_alert_targets.Get().end();
-       ++iter) {
-    AXPlatformNodeWin* target = *iter;
-    if (IsDescendant(target))
-      alert_targets.push_back(target);
-  }
-
-  long count = static_cast<long>(alert_targets.size());
-  if (count == 0)
-    return S_FALSE;
-
-  // Don't return more targets than max_targets - but note that the caller
-  // is allowed to specify max_targets=0 to mean no limit.
-  if (max_targets > 0 && count > max_targets)
-    count = max_targets;
-
-  // Return the number of targets.
-  *n_targets = count;
-
-  // Allocate COM memory for the result array and populate it.
-  *targets = static_cast<IUnknown**>(
-      CoTaskMemAlloc(count * sizeof(IUnknown*)));
-  for (long i = 0; i < count; ++i) {
-    (*targets)[i] = static_cast<IAccessible*>(alert_targets[i]);
-    (*targets)[i]->AddRef();
-  }
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_attributes(BSTR* attributes) {
-  COM_OBJECT_VALIDATE_1_ARG(attributes);
-  base::string16 attributes_str;
-
-  // Text fields need to report the attribute "text-model:a1" to instruct
-  // screen readers to use IAccessible2 APIs to handle text editing in this
-  // object (as opposed to treating it like a native Windows text box).
-  // The text-model:a1 attribute is documented here:
-  // http://www.linuxfoundation.org/collaborate/workgroups/accessibility/ia2/ia2_implementation_guide
-  if (GetData().role == ui::AX_ROLE_TEXT_FIELD) {
-    attributes_str = L"text-model:a1;";
-  }
-
-  *attributes = SysAllocString(attributes_str.c_str());
-  DCHECK(*attributes);
-  return S_OK;
-}
-
-//
-// IAccessibleText
-//
-
-STDMETHODIMP AXPlatformNodeWin::get_nCharacters(LONG* n_characters) {
-  COM_OBJECT_VALIDATE_1_ARG(n_characters);
-  base::string16 text = TextForIAccessibleText();
-  *n_characters = static_cast<LONG>(text.size());
-
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_caretOffset(LONG* offset) {
-  COM_OBJECT_VALIDATE_1_ARG(offset);
-  *offset = static_cast<LONG>(GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END));
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_nSelections(LONG* n_selections) {
-  COM_OBJECT_VALIDATE_1_ARG(n_selections);
-  int sel_start = GetIntAttribute(ui::AX_ATTR_TEXT_SEL_START);
-  int sel_end = GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END);
-  if (sel_start != sel_end)
-    *n_selections = 1;
-  else
-    *n_selections = 0;
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_selection(LONG selection_index,
-                                              LONG* start_offset,
-                                              LONG* end_offset) {
-  COM_OBJECT_VALIDATE_2_ARGS(start_offset, end_offset);
-  if (selection_index != 0)
-    return E_INVALIDARG;
-
-  *start_offset = static_cast<LONG>(
-      GetIntAttribute(ui::AX_ATTR_TEXT_SEL_START));
-  *end_offset = static_cast<LONG>(
-      GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END));
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_text(LONG start_offset,
-                                         LONG end_offset,
-                                         BSTR* text) {
-  COM_OBJECT_VALIDATE_1_ARG(text);
-  int sel_end = GetIntAttribute(ui::AX_ATTR_TEXT_SEL_START);
-  base::string16 text_str = TextForIAccessibleText();
-  LONG len = static_cast<LONG>(text_str.size());
-
-  if (start_offset == IA2_TEXT_OFFSET_LENGTH) {
-    start_offset = len;
-  } else if (start_offset == IA2_TEXT_OFFSET_CARET) {
-    start_offset = static_cast<LONG>(sel_end);
-  }
-  if (end_offset == IA2_TEXT_OFFSET_LENGTH) {
-    end_offset = static_cast<LONG>(text_str.size());
-  } else if (end_offset == IA2_TEXT_OFFSET_CARET) {
-    end_offset = static_cast<LONG>(sel_end);
-  }
-
-  // The spec allows the arguments to be reversed.
-  if (start_offset > end_offset) {
-    LONG tmp = start_offset;
-    start_offset = end_offset;
-    end_offset = tmp;
-  }
-
-  // The spec does not allow the start or end offsets to be out or range;
-  // we must return an error if so.
-  if (start_offset < 0)
-    return E_INVALIDARG;
-  if (end_offset > len)
-    return E_INVALIDARG;
-
-  base::string16 substr =
-      text_str.substr(start_offset, end_offset - start_offset);
-  if (substr.empty())
-    return S_FALSE;
-
-  *text = SysAllocString(substr.c_str());
-  DCHECK(*text);
-  return S_OK;
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_textAtOffset(
-    LONG offset,
-    enum IA2TextBoundaryType boundary_type,
-    LONG* start_offset, LONG* end_offset,
-    BSTR* text) {
-  COM_OBJECT_VALIDATE_3_ARGS(start_offset, end_offset, text);
-  // The IAccessible2 spec says we don't have to implement the "sentence"
-  // boundary type, we can just let the screen reader handle it.
-  if (boundary_type == IA2_TEXT_BOUNDARY_SENTENCE) {
-    *start_offset = 0;
-    *end_offset = 0;
-    *text = nullptr;
-    return S_FALSE;
-  }
-
-  const base::string16& text_str = TextForIAccessibleText();
-
-  *start_offset = FindBoundary(
-      text_str, boundary_type, offset, ui::BACKWARDS_DIRECTION);
-  *end_offset = FindBoundary(
-      text_str, boundary_type, offset, ui::FORWARDS_DIRECTION);
-  return get_text(*start_offset, *end_offset, text);
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_textBeforeOffset(
-    LONG offset,
-    enum IA2TextBoundaryType boundary_type,
-    LONG* start_offset, LONG* end_offset,
-    BSTR* text) {
-  if (!start_offset || !end_offset || !text)
-    return E_INVALIDARG;
-
-  // The IAccessible2 spec says we don't have to implement the "sentence"
-  // boundary type, we can just let the screenreader handle it.
-  if (boundary_type == IA2_TEXT_BOUNDARY_SENTENCE) {
-    *start_offset = 0;
-    *end_offset = 0;
-    *text = nullptr;
-    return S_FALSE;
-  }
-
-  const base::string16& text_str = TextForIAccessibleText();
-
-  *start_offset = FindBoundary(
-      text_str, boundary_type, offset, ui::BACKWARDS_DIRECTION);
-  *end_offset = offset;
-  return get_text(*start_offset, *end_offset, text);
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_textAfterOffset(
-    LONG offset,
-    enum IA2TextBoundaryType boundary_type,
-    LONG* start_offset, LONG* end_offset,
-    BSTR* text) {
-  if (!start_offset || !end_offset || !text)
-    return E_INVALIDARG;
-
-  // The IAccessible2 spec says we don't have to implement the "sentence"
-  // boundary type, we can just let the screenreader handle it.
-  if (boundary_type == IA2_TEXT_BOUNDARY_SENTENCE) {
-    *start_offset = 0;
-    *end_offset = 0;
-    *text = nullptr;
-    return S_FALSE;
-  }
-
-  const base::string16& text_str = TextForIAccessibleText();
-
-  *start_offset = offset;
-  *end_offset = FindBoundary(
-      text_str, boundary_type, offset, ui::FORWARDS_DIRECTION);
-  return get_text(*start_offset, *end_offset, text);
-}
-
-STDMETHODIMP AXPlatformNodeWin::get_offsetAtPoint(
-    LONG x, LONG y, enum IA2CoordinateType coord_type, LONG* offset) {
-  COM_OBJECT_VALIDATE_1_ARG(offset);
-  // We don't support this method, but we have to return something
-  // rather than E_NOTIMPL or screen readers will complain.
-  *offset = 0;
-  return S_OK;
-}
-
-//
-// IServiceProvider implementation.
-//
-
-STDMETHODIMP AXPlatformNodeWin::QueryService(
-    REFGUID guidService, REFIID riid, void** object) {
-  COM_OBJECT_VALIDATE_1_ARG(object);
-  if (guidService == IID_IAccessible ||
-      guidService == IID_IAccessible2 ||
-      guidService == IID_IAccessible2_2 ||
-      guidService == IID_IAccessibleText) {
-    return QueryInterface(riid, object);
-  }
-
-  *object = nullptr;
-  return E_FAIL;
-}
-
-//
-// Private member functions.
-//
-
-bool AXPlatformNodeWin::IsValidId(const VARIANT& child) const {
-  // Since we have a separate IAccessible COM object for each node, we only
-  // support the CHILDID_SELF id.
-  return (VT_I4 == child.vt) && (CHILDID_SELF == child.lVal);
-}
-
-int AXPlatformNodeWin::MSAARole() {
-  switch (GetData().role) {
-    case ui::AX_ROLE_ALERT:
-      return ROLE_SYSTEM_ALERT;
-    case ui::AX_ROLE_APPLICATION:
-      return ROLE_SYSTEM_APPLICATION;
-    case ui::AX_ROLE_BUTTON_DROP_DOWN:
-      return ROLE_SYSTEM_BUTTONDROPDOWN;
-    case ui::AX_ROLE_POP_UP_BUTTON:
-      return ROLE_SYSTEM_BUTTONMENU;
-    case ui::AX_ROLE_CHECK_BOX:
-      return ROLE_SYSTEM_CHECKBUTTON;
-    case ui::AX_ROLE_COMBO_BOX:
-      return ROLE_SYSTEM_COMBOBOX;
-    case ui::AX_ROLE_DIALOG:
-      return ROLE_SYSTEM_DIALOG;
-    case ui::AX_ROLE_GROUP:
-      return ROLE_SYSTEM_GROUPING;
-    case ui::AX_ROLE_IMAGE:
-      return ROLE_SYSTEM_GRAPHIC;
-    case ui::AX_ROLE_LINK:
-      return ROLE_SYSTEM_LINK;
-    case ui::AX_ROLE_LOCATION_BAR:
-      return ROLE_SYSTEM_GROUPING;
-    case ui::AX_ROLE_MENU_BAR:
-      return ROLE_SYSTEM_MENUBAR;
-    case ui::AX_ROLE_MENU_ITEM:
-      return ROLE_SYSTEM_MENUITEM;
-    case ui::AX_ROLE_MENU_LIST_POPUP:
-      return ROLE_SYSTEM_MENUPOPUP;
-    case ui::AX_ROLE_TREE:
-      return ROLE_SYSTEM_OUTLINE;
-    case ui::AX_ROLE_TREE_ITEM:
-      return ROLE_SYSTEM_OUTLINEITEM;
-    case ui::AX_ROLE_TAB:
-      return ROLE_SYSTEM_PAGETAB;
-    case ui::AX_ROLE_TAB_LIST:
-      return ROLE_SYSTEM_PAGETABLIST;
-    case ui::AX_ROLE_PANE:
-      return ROLE_SYSTEM_PANE;
-    case ui::AX_ROLE_PROGRESS_INDICATOR:
-      return ROLE_SYSTEM_PROGRESSBAR;
-    case ui::AX_ROLE_BUTTON:
-      return ROLE_SYSTEM_PUSHBUTTON;
-    case ui::AX_ROLE_RADIO_BUTTON:
-      return ROLE_SYSTEM_RADIOBUTTON;
-    case ui::AX_ROLE_SCROLL_BAR:
-      return ROLE_SYSTEM_SCROLLBAR;
-    case ui::AX_ROLE_SPLITTER:
-      return ROLE_SYSTEM_SEPARATOR;
-    case ui::AX_ROLE_SLIDER:
-      return ROLE_SYSTEM_SLIDER;
-    case ui::AX_ROLE_STATIC_TEXT:
-      return ROLE_SYSTEM_STATICTEXT;
-    case ui::AX_ROLE_TEXT_FIELD:
-      return ROLE_SYSTEM_TEXT;
-    case ui::AX_ROLE_TITLE_BAR:
-      return ROLE_SYSTEM_TITLEBAR;
-    case ui::AX_ROLE_TOOLBAR:
-      return ROLE_SYSTEM_TOOLBAR;
-    case ui::AX_ROLE_WEB_VIEW:
-      return ROLE_SYSTEM_GROUPING;
-    case ui::AX_ROLE_WINDOW:
-      return ROLE_SYSTEM_WINDOW;
-    case ui::AX_ROLE_CLIENT:
-    default:
-      // This is the default role for MSAA.
-      return ROLE_SYSTEM_CLIENT;
-  }
-}
-
-int AXPlatformNodeWin::MSAAState() {
-  uint32 state = GetData().state;
-
-  int msaa_state = 0;
-  if (state & (1 << ui::AX_STATE_CHECKED))
-    msaa_state |= STATE_SYSTEM_CHECKED;
-  if (state & (1 << ui::AX_STATE_COLLAPSED))
-    msaa_state |= STATE_SYSTEM_COLLAPSED;
-  if (state & (1 << ui::AX_STATE_DEFAULT))
-    msaa_state |= STATE_SYSTEM_DEFAULT;
-  if (state & (1 << ui::AX_STATE_EXPANDED))
-    msaa_state |= STATE_SYSTEM_EXPANDED;
-  if (state & (1 << ui::AX_STATE_FOCUSABLE))
-    msaa_state |= STATE_SYSTEM_FOCUSABLE;
-  if (state & (1 << ui::AX_STATE_FOCUSED))
-    msaa_state |= STATE_SYSTEM_FOCUSED;
-  if (state & (1 << ui::AX_STATE_HASPOPUP))
-    msaa_state |= STATE_SYSTEM_HASPOPUP;
-  if (state & (1 << ui::AX_STATE_HOVERED))
-    msaa_state |= STATE_SYSTEM_HOTTRACKED;
-  if (state & (1 << ui::AX_STATE_INVISIBLE))
-    msaa_state |= STATE_SYSTEM_INVISIBLE;
-  if (state & (1 << ui::AX_STATE_LINKED))
-    msaa_state |= STATE_SYSTEM_LINKED;
-  if (state & (1 << ui::AX_STATE_OFFSCREEN))
-    msaa_state |= STATE_SYSTEM_OFFSCREEN;
-  if (state & (1 << ui::AX_STATE_PRESSED))
-    msaa_state |= STATE_SYSTEM_PRESSED;
-  if (state & (1 << ui::AX_STATE_PROTECTED))
-    msaa_state |= STATE_SYSTEM_PROTECTED;
-  if (state & (1 << ui::AX_STATE_READ_ONLY))
-    msaa_state |= STATE_SYSTEM_READONLY;
-  if (state & (1 << ui::AX_STATE_SELECTABLE))
-    msaa_state |= STATE_SYSTEM_SELECTABLE;
-  if (state & (1 << ui::AX_STATE_SELECTED))
-    msaa_state |= STATE_SYSTEM_SELECTED;
-  if (state & (1 << ui::AX_STATE_DISABLED))
-    msaa_state |= STATE_SYSTEM_UNAVAILABLE;
-
-  return msaa_state;
-}
-
-int AXPlatformNodeWin::MSAAEvent(ui::AXEvent event) {
-  switch (event) {
-    case ui::AX_EVENT_ALERT:
-      return EVENT_SYSTEM_ALERT;
-    case ui::AX_EVENT_FOCUS:
-      return EVENT_OBJECT_FOCUS;
-    case ui::AX_EVENT_MENU_START:
-      return EVENT_SYSTEM_MENUSTART;
-    case ui::AX_EVENT_MENU_END:
-      return EVENT_SYSTEM_MENUEND;
-    case ui::AX_EVENT_MENU_POPUP_START:
-      return EVENT_SYSTEM_MENUPOPUPSTART;
-    case ui::AX_EVENT_MENU_POPUP_END:
-      return EVENT_SYSTEM_MENUPOPUPEND;
-    case ui::AX_EVENT_SELECTION:
-      return EVENT_OBJECT_SELECTION;
-    case ui::AX_EVENT_SELECTION_ADD:
-      return EVENT_OBJECT_SELECTIONADD;
-    case ui::AX_EVENT_SELECTION_REMOVE:
-      return EVENT_OBJECT_SELECTIONREMOVE;
-    case ui::AX_EVENT_TEXT_CHANGED:
-      return EVENT_OBJECT_NAMECHANGE;
-    case ui::AX_EVENT_TEXT_SELECTION_CHANGED:
-      return IA2_EVENT_TEXT_CARET_MOVED;
-    case ui::AX_EVENT_VALUE_CHANGED:
-      return EVENT_OBJECT_VALUECHANGE;
-    default:
-      return -1;
-  }
-}
-
-HRESULT AXPlatformNodeWin::GetStringAttributeAsBstr(
-    ui::AXStringAttribute attribute,
-    BSTR* value_bstr) const {
-  base::string16 str;
-
-  if (!GetString16Attribute(attribute, &str))
-    return S_FALSE;
-
-  if (str.empty())
-    return S_FALSE;
-
-  *value_bstr = SysAllocString(str.c_str());
-  DCHECK(*value_bstr);
-
-  return S_OK;
-}
-
-void AXPlatformNodeWin::AddAlertTarget() {
-  g_alert_targets.Get().insert(this);
-}
-
-void AXPlatformNodeWin::RemoveAlertTarget() {
-  if (g_alert_targets.Get().find(this) != g_alert_targets.Get().end())
-    g_alert_targets.Get().erase(this);
-}
-
-base::string16 AXPlatformNodeWin::TextForIAccessibleText() {
-  if (GetData().role == ui::AX_ROLE_TEXT_FIELD)
-    return GetString16Attribute(ui::AX_ATTR_VALUE);
-  else
-    return GetString16Attribute(ui::AX_ATTR_NAME);
-}
-
-void AXPlatformNodeWin::HandleSpecialTextOffset(
-    const base::string16& text, LONG* offset) {
-  if (*offset == IA2_TEXT_OFFSET_LENGTH) {
-    *offset = static_cast<LONG>(text.size());
-  } else if (*offset == IA2_TEXT_OFFSET_CARET) {
-    get_caretOffset(offset);
-  }
-}
-
-ui::TextBoundaryType AXPlatformNodeWin::IA2TextBoundaryToTextBoundary(
-    IA2TextBoundaryType ia2_boundary) {
-  switch(ia2_boundary) {
-    case IA2_TEXT_BOUNDARY_CHAR: return ui::CHAR_BOUNDARY;
-    case IA2_TEXT_BOUNDARY_WORD: return ui::WORD_BOUNDARY;
-    case IA2_TEXT_BOUNDARY_LINE: return ui::LINE_BOUNDARY;
-    case IA2_TEXT_BOUNDARY_SENTENCE: return ui::SENTENCE_BOUNDARY;
-    case IA2_TEXT_BOUNDARY_PARAGRAPH: return ui::PARAGRAPH_BOUNDARY;
-    case IA2_TEXT_BOUNDARY_ALL: return ui::ALL_BOUNDARY;
-    default:
-      NOTREACHED();
-      return ui::CHAR_BOUNDARY;
-  }
-}
-
-LONG AXPlatformNodeWin::FindBoundary(
-    const base::string16& text,
-    IA2TextBoundaryType ia2_boundary,
-    LONG start_offset,
-    ui::TextBoundaryDirection direction) {
-  HandleSpecialTextOffset(text, &start_offset);
-  ui::TextBoundaryType boundary = IA2TextBoundaryToTextBoundary(ia2_boundary);
-  std::vector<int32> line_breaks;
-  return static_cast<LONG>(ui::FindAccessibleTextBoundary(
-      text, line_breaks, boundary, start_offset, direction));
-}
-
-}  // namespace ui