Further instrumentations to find jank in Windows message processing.

base/message_loop/message_pump_win.cc

 // Copyright (c) 2012 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 "base/message_loop/message_pump_win.h"
 
 #include <math.h>
 
 #include "base/debug/trace_event.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 303 matching lines @@
 
   state_->delegate->DoDelayedWork(&delayed_work_time_);
   if (!delayed_work_time_.is_null()) {
     // A bit gratuitous to set delayed_work_time_ again, but oh well.
     ScheduleDelayedWork(delayed_work_time_);
   }
 }
 
 bool MessagePumpForUI::ProcessNextWindowsMessage() {
   // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
-  tracked_objects::ScopedTracker tracking_profile(
+  tracked_objects::ScopedTracker tracking_profile1(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
-          "440919 <<MessagePumpForUI::ProcessNextWindowsMessage>>"));
+          "440919 MessagePumpForUI::ProcessNextWindowsMessage1"));
 
   // If there are sent messages in the queue then PeekMessage internally
   // dispatches the message and returns false. We return true in this
   // case to ensure that the message loop peeks again instead of calling
   // MsgWaitForMultipleObjectsEx again.
   bool sent_messages_in_queue = false;
   DWORD queue_status = GetQueueStatus(QS_SENDMESSAGE);
   if (HIWORD(queue_status) & QS_SENDMESSAGE)
     sent_messages_in_queue = true;
 
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
+  tracked_objects::ScopedTracker tracking_profile2(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "440919 MessagePumpForUI::ProcessNextWindowsMessage2"));
+
   MSG msg;
   if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE) != FALSE)
     return ProcessMessageHelper(msg);
 
   return sent_messages_in_queue;
 }
 
 bool MessagePumpForUI::ProcessMessageHelper(const MSG& msg) {
   // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
-  tracked_objects::ScopedTracker tracking_profile(
+  tracked_objects::ScopedTracker tracking_profile1(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
-          "440919 MessagePumpForUI::ProcessMessageHelper"));
+          "440919 MessagePumpForUI::ProcessMessageHelper1"));
 
   TRACE_EVENT1("base", "MessagePumpForUI::ProcessMessageHelper",
                "message", msg.message);
   if (WM_QUIT == msg.message) {
     // Repost the QUIT message so that it will be retrieved by the primary
     // GetMessage() loop.
     state_->should_quit = true;
     PostQuitMessage(static_cast<int>(msg.wParam));
     return false;
   }
 
   // While running our main message pump, we discard kMsgHaveWork messages.
   if (msg.message == kMsgHaveWork && msg.hwnd == message_hwnd_)
     return ProcessPumpReplacementMessage();
 
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
+  tracked_objects::ScopedTracker tracking_profile2(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "440919 MessagePumpForUI::ProcessMessageHelper2"));
+
   if (CallMsgFilter(const_cast<MSG*>(&msg), kMessageFilterCode))
     return true;
 
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
+  tracked_objects::ScopedTracker tracking_profile3(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "440919 MessagePumpForUI::ProcessMessageHelper3"));
+
   uint32_t action = MessagePumpDispatcher::POST_DISPATCH_PERFORM_DEFAULT;
   if (state_->dispatcher)
     action = state_->dispatcher->Dispatch(msg);
   if (action & MessagePumpDispatcher::POST_DISPATCH_QUIT_LOOP)
     state_->should_quit = true;
   if (action & MessagePumpDispatcher::POST_DISPATCH_PERFORM_DEFAULT) {
     TranslateMessage(&msg);
     DispatchMessage(&msg);
   }
 
   return true;
 }
 
 bool MessagePumpForUI::ProcessPumpReplacementMessage() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "440919 MessagePumpForUI::ProcessPumpReplacementMessage"));
+
   // When we encounter a kMsgHaveWork message, this method is called to peek
   // and process a replacement message, such as a WM_PAINT or WM_TIMER.  The
   // goal is to make the kMsgHaveWork as non-intrusive as possible, even though
   // a continuous stream of such messages are posted.  This method carefully
   // peeks a message while there is no chance for a kMsgHaveWork to be pending,
   // then resets the have_work_ flag (allowing a replacement kMsgHaveWork to
   // possibly be posted), and finally dispatches that peeked replacement.  Note
   // that the re-post of kMsgHaveWork may be asynchronous to this thread!!
 
   bool have_message = false;
@@ skipping 247 matching lines @@
 
 // static
 MessagePumpForIO::IOHandler* MessagePumpForIO::KeyToHandler(
     ULONG_PTR key,
     bool* has_valid_io_context) {
   *has_valid_io_context = ((key & 1) == 0);
   return reinterpret_cast<IOHandler*>(key & ~static_cast<ULONG_PTR>(1));
 }
 
 }  // namespace base