Create only a single LegacyRenderWidgetHostHWND per WebContentsViewAura.

content/browser/renderer_host/legacy_render_widget_host_win.cc

Index: content/browser/renderer_host/legacy_render_widget_host_win.cc
diff --git a/content/browser/renderer_host/legacy_render_widget_host_win.cc b/content/browser/renderer_host/legacy_render_widget_host_win.cc
index 327e0b9b43e73df9a7280366ecd5d05eed899ba2..25333b365c2609e261f348d8433019979cbbd07c 100644
--- a/content/browser/renderer_host/legacy_render_widget_host_win.cc
+++ b/content/browser/renderer_host/legacy_render_widget_host_win.cc
@@ -7,8 +7,7 @@
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/win/windows_version.h"
-#include "content/browser/accessibility/browser_accessibility_manager_win.h"
-#include "content/browser/accessibility/browser_accessibility_win.h"
+#include "content/browser/renderer_host/legacy_render_widget_host_win_delegate.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 #include "content/public/browser/browser_accessibility_state.h"
@@ -22,40 +21,44 @@
 
 namespace content {
 
+namespace {
+
 // A custom MSAA object id used to determine if a screen reader or some
 // other client is listening on MSAA events - if so, we enable full web
 // accessibility support.
 const int kIdScreenReaderHoneyPot = 1;
 
+}  // namespace
+
+LegacyRenderWidgetHostHWND::~LegacyRenderWidgetHostHWND() {
+  if (::IsWindow(hwnd()))
+    ::DestroyWindow(hwnd());
+}
+
 // static
 LegacyRenderWidgetHostHWND* LegacyRenderWidgetHostHWND::Create(
-    HWND parent) {
-  // content_unittests passes in the desktop window as the parent. We allow
-  // the LegacyRenderWidgetHostHWND instance to be created in this case for
-  // these tests to pass.
+    HWND parent,
+    LegacyRenderWidgetHostHWNDDelegate* delegate) {
   if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kDisableLegacyIntermediateWindow) ||
-      (!GetWindowEventTarget(parent) && parent != ::GetDesktopWindow()))
-    return NULL;
+          switches::kDisableLegacyIntermediateWindow)) {
+    return nullptr;
+  }
 
   LegacyRenderWidgetHostHWND* legacy_window_instance =
-      new LegacyRenderWidgetHostHWND(parent);
-  // If we failed to create the child, or if the switch to disable the legacy
-  // window is passed in, then return NULL.
+      new LegacyRenderWidgetHostHWND(parent, delegate);
+  // If we failed to create the child, return NULL.
   if (!::IsWindow(legacy_window_instance->hwnd())) {
     delete legacy_window_instance;
-    return NULL;
+    return nullptr;
   }
   legacy_window_instance->Init();
   return legacy_window_instance;
 }
 
-void LegacyRenderWidgetHostHWND::Destroy() {
-  if (::IsWindow(hwnd()))
-    ::DestroyWindow(hwnd());
-}
-
 void LegacyRenderWidgetHostHWND::UpdateParent(HWND parent) {
+  if (!::IsWindow(hwnd()))
+    return;
+
   ::SetParent(hwnd(), parent);
   // If the new parent is the desktop Window, then we disable the child window
   // to ensure that it does not receive any input events. It should not because
@@ -68,49 +71,49 @@ void LegacyRenderWidgetHostHWND::UpdateParent(HWND parent) {
 }
 
 HWND LegacyRenderWidgetHostHWND::GetParent() {
+  if (!::IsWindow(hwnd()))
+    return NULL;
+
   return ::GetParent(hwnd());
 }
 
 void LegacyRenderWidgetHostHWND::Show() {
-  ::ShowWindow(hwnd(), SW_SHOW);
+  if (::IsWindow(hwnd()))
+    ::ShowWindow(hwnd(), SW_SHOW);
 }
 
 void LegacyRenderWidgetHostHWND::Hide() {
-  ::ShowWindow(hwnd(), SW_HIDE);
+  if (::IsWindow(hwnd()))
+    ::ShowWindow(hwnd(), SW_HIDE);
 }
 
 void LegacyRenderWidgetHostHWND::SetBounds(const gfx::Rect& bounds) {
+  if (!::IsWindow(hwnd()))
+    return;
+
   gfx::Rect bounds_in_pixel = gfx::win::DIPToScreenRect(bounds);
   ::SetWindowPos(hwnd(), NULL, bounds_in_pixel.x(), bounds_in_pixel.y(),
                  bounds_in_pixel.width(), bounds_in_pixel.height(),
                  SWP_NOREDRAW);
 }
 
-void LegacyRenderWidgetHostHWND::OnFinalMessage(HWND hwnd) {
-  if (host_) {
-    host_->OnLegacyWindowDestroyed();
-    host_ = NULL;
-  }
-  delete this;
-}
-
-LegacyRenderWidgetHostHWND::LegacyRenderWidgetHostHWND(HWND parent)
+LegacyRenderWidgetHostHWND::LegacyRenderWidgetHostHWND(
+    HWND parent,
+    LegacyRenderWidgetHostHWNDDelegate* delegate)
     : mouse_tracking_enabled_(false),
-      host_(NULL) {
+      delegate_(delegate) {
+  DCHECK(delegate_);
   RECT rect = {0};
   Base::Create(parent, rect, L"Chrome Legacy Window",
                WS_CHILDWINDOW | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
                WS_EX_TRANSPARENT);
 }
 
-LegacyRenderWidgetHostHWND::~LegacyRenderWidgetHostHWND() {
-  DCHECK(!::IsWindow(hwnd()));
-}
-
 bool LegacyRenderWidgetHostHWND::Init() {
   if (base::win::GetVersion() >= base::win::VERSION_WIN7 &&
-      ui::AreTouchEventsEnabled())
+      ui::AreTouchEventsEnabled()) {
     RegisterTouchWindow(hwnd(), TWF_WANTPALM);
+  }
 
   HRESULT hr = ::CreateStdAccessibleObject(
       hwnd(), OBJID_WINDOW, IID_IAccessible,
@@ -154,24 +157,16 @@ LRESULT LegacyRenderWidgetHostHWND::OnGetObject(UINT message,
     return static_cast<LRESULT>(0L);
   }
 
-  if (OBJID_CLIENT != obj_id || !host_)
-    return static_cast<LRESULT>(0L);
-
-  RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(
-      host_->GetRenderWidgetHost());
-  if (!rwhi)
+  if (OBJID_CLIENT != obj_id)
     return static_cast<LRESULT>(0L);
 
-  BrowserAccessibilityManagerWin* manager =
-      static_cast<BrowserAccessibilityManagerWin*>(
-          rwhi->GetRootBrowserAccessibilityManager());
-  if (!manager)
+  base::win::ScopedComPtr<IAccessible> native_accessible(
+      delegate_->GetNativeViewAccessible());
+  if (!native_accessible)
     return static_cast<LRESULT>(0L);
 
-  base::win::ScopedComPtr<IAccessible> root(
-      manager->GetRoot()->ToBrowserAccessibilityWin());
   return LresultFromObject(IID_IAccessible, w_param,
-      static_cast<IAccessible*>(root.Detach()));
+      static_cast<IAccessible*>(native_accessible.Detach()));
 }
 
 // We send keyboard/mouse/touch messages to the parent window via SendMessage.