Add more logging to track down flakiness.

content/browser/renderer_host/legacy_render_widget_host_win.cc

 // Copyright (c) 2014 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 "content/browser/renderer_host/legacy_render_widget_host_win.h"
 
 #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"
@@ skipping 129 matching lines @@
   return 1;
 }
 
 LRESULT LegacyRenderWidgetHostHWND::OnGetObject(UINT message,
                                                 WPARAM w_param,
                                                 LPARAM l_param) {
   // Only the lower 32 bits of l_param are valid when checking the object id
   // because it sometimes gets sign-extended incorrectly (but not always).
   DWORD obj_id = static_cast<DWORD>(static_cast<DWORD_PTR>(l_param));
 
+  // http://crbug.com/440579 TODO(dmazzoni): remove this logging when
+  // flakiness is fixed.
+  LOG(INFO) << "LegacyRenderWidgetHostHWND::OnGetObject"
+            << " message=" << message
+            << " w_param=" << w_param
+            << " l_param=" << l_param
+            << " obj_id=" << obj_id
+            << " host_=" << host_;
+
   if (kIdScreenReaderHoneyPot == obj_id) {
     // When an MSAA client has responded to our fake event on this id,
     // enable screen reader support.
     BrowserAccessibilityState::GetInstance()->OnScreenReaderDetected();
     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 (!rwhi) {
+    LOG(WARNING) << "No RWHI";
     return static_cast<LRESULT>(0L);
+  }
 
   BrowserAccessibilityManagerWin* manager =
       static_cast<BrowserAccessibilityManagerWin*>(
           rwhi->GetRootBrowserAccessibilityManager());
-  if (!manager)
+  if (!manager) {
+    LOG(WARNING) << "No manager";
     return static_cast<LRESULT>(0L);
+  }
 
   base::win::ScopedComPtr<IAccessible> root(
       manager->GetRoot()->ToBrowserAccessibilityWin());
   return LresultFromObject(IID_IAccessible, w_param,
       static_cast<IAccessible*>(root.Detach()));
 }
 
 // We send keyboard/mouse/touch messages to the parent window via SendMessage.
 // While this works, this has the side effect of converting input messages into
 // sent messages which changes their priority and could technically result
@@ skipping 191 matching lines @@
   // generate the legacy WM_VSCROLL/WM_HSCROLL messages.
   // We add these styles to ensure that trackpad/trackpoint scrolling
   // work.
   long current_style = ::GetWindowLong(hwnd(), GWL_STYLE);
   ::SetWindowLong(hwnd(), GWL_STYLE,
                   current_style | WS_VSCROLL | WS_HSCROLL);
   return 0;
 }
 
 }  // namespace content