Fix RAF-stall that occurs when switching between WebGL animation and another tab.

content/renderer/render_widget.cc

 // Copyright (c) 2011 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/renderer/render_widget.h"
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 285 matching lines @@
       // Resize should have caused an invalidation of the entire view.
       DCHECK(paint_aggregator_.HasPendingUpdate());
     }
 
     // We will send the Resize_ACK flag once we paint again.
     set_next_paint_is_resize_ack();
   }
 }
 
 void RenderWidget::OnWasHidden() {
+  TRACE_EVENT0("renderer", "RenderWidget::OnWasHidden");
   // Go into a mode where we stop generating paint and scrolling events.
   SetHidden(true);
 }
 
 void RenderWidget::OnWasRestored(bool needs_repainting) {
+  TRACE_EVENT0("renderer", "RenderWidget::OnWasRestored");
   // During shutdown we can just ignore this message.
   if (!webwidget_)
     return;
 
   // See OnWasHidden
   SetHidden(false);
 
   if (!needs_repainting && !needs_repainting_on_restore_)
     return;
   needs_repainting_on_restore_ = false;
 
   // Tag the next paint as a restore ack, which is picked up by
   // DoDeferredUpdate when it sends out the next PaintRect message.
   set_next_paint_is_restore_ack();
 
   // Generate a full repaint.
   if (!is_accelerated_compositing_active_) {
     didInvalidateRect(gfx::Rect(size_.width(), size_.height()));
   } else {
-#ifndef WTF_USE_THREADED_COMPOSITING
+#ifdef WTF_USE_THREADED_COMPOSITING
     webwidget_->composite(false);
 #else
     scheduleComposite();
 #endif
   }
 }
 
 void RenderWidget::OnWasSwappedOut() {
   // If we have been swapped out and no one else is using this process,
   // it's safe to exit now.  If we get swapped back in, we will call
@@ skipping 1008 matching lines @@
 
 void RenderWidget::CleanupWindowInPluginMoves(gfx::PluginWindowHandle window) {
   for (WebPluginGeometryVector::iterator i = plugin_window_moves_.begin();
        i != plugin_window_moves_.end(); ++i) {
     if (i->window == window) {
       plugin_window_moves_.erase(i);
       break;
     }
   }
 }