Disable support for swapped out RenderFrame(Host) and add instrumentation

content/renderer/render_widget.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 "content/renderer/render_widget.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/debug/dump_without_crashing.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/sys_info.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_synthetic_delay.h"
@@ skipping 1265 matching lines @@
     webwidget_->setCursorVisibilityState(is_visible);
 }
 
 void RenderWidget::OnMouseCaptureLost() {
   if (webwidget_)
     webwidget_->mouseCaptureLost();
 }
 
 void RenderWidget::OnSetFocus(bool enable) {
   has_focus_ = enable;
+
+  // TODO(nasko): This code is here to help diagnose https://crbug.com/541578.
+  if (webwidget_->isWebView()) {
+    blink::WebView* view = static_cast<blink::WebView*>(webwidget_);
+    if (view->mainFrame()->isWebRemoteFrame()) {
+      blink::WebFrame* mainFrame = view->mainFrame();
+
+      base::debug::Alias(&mainFrame);
+      base::debug::Alias(&is_swapped_out_);
+
+      base::debug::DumpWithoutCrashing();
+    }
+  }
+
   if (webwidget_)
     webwidget_->setFocus(enable);
 }
 
 void RenderWidget::FlushPendingInputEventAck() {
   if (pending_input_event_ack_) {
     TRACE_EVENT_ASYNC_END0("input", "RenderWidget::ThrottledInputEventAck",
                            pending_input_event_ack_.get());
     Send(pending_input_event_ack_.release());
   }
@@ skipping 1074 matching lines @@
 void RenderWidget::RegisterVideoHoleFrame(RenderFrameImpl* frame) {
   video_hole_frames_.AddObserver(frame);
 }
 
 void RenderWidget::UnregisterVideoHoleFrame(RenderFrameImpl* frame) {
   video_hole_frames_.RemoveObserver(frame);
 }
 #endif  // defined(VIDEO_HOLE)
 
 }  // namespace content