Try to diagnose blink reinitialisation in WebView.

content/browser/browser_main_loop.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/browser/browser_main_loop.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 383 matching lines @@
   // In absence of valid switches use the automatic defaults.
   return new base::win::MemoryPressureMonitor();
 }
 #endif  // defined(OS_WIN)
 
 }  // namespace
 
 // The currently-running BrowserMainLoop.  There can be one or zero.
 BrowserMainLoop* g_current_browser_main_loop = NULL;
 
+#if defined(OS_ANDROID)
+bool g_browser_main_loop_shutting_down = false;
+#endif
+
 // For measuring memory usage after each task. Behind a command line flag.
 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
  public:
   MemoryObserver() {}
   ~MemoryObserver() override {}
 
   void WillProcessTask(const base::PendingTask& pending_task) override {}
 
   void DidProcessTask(const base::PendingTask& pending_task) override {
     std::unique_ptr<base::ProcessMetrics> process_metrics(
@@ skipping 567 matching lines @@
   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 
   // Teardown may start in PostMainMessageLoopRun, and during teardown we
   // need to be able to perform IO.
   base::ThreadRestrictions::SetIOAllowed(true);
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
                  true));
 
+#if defined(OS_ANDROID)
+  g_browser_main_loop_shutting_down = true;
+#endif
+
   if (RenderProcessHost::run_renderer_in_process())
     RenderProcessHostImpl::ShutDownInProcessRenderer();
 
   if (parts_) {
     TRACE_EVENT0("shutdown",
                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
     parts_->PostMainMessageLoopRun();
   }
 
   if (IsRunningInMojoShell())
@@ skipping 531 matching lines @@
                                                  std::move(worker_task_runner),
                                                  MediaInternals::GetInstance());
   }
   CHECK(audio_manager_);
 
   if (use_hang_monitor)
     media::AudioManager::StartHangMonitor(io_thread_->task_runner());
 }
 
 }  // namespace content