DevTools: disable interrupts when dispatching inspector commands

Source/core/inspector/InspectorTaskRunner.cpp

 // Copyright 2015 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 "config.h"
 #include "core/inspector/InspectorTaskRunner.h"
 
 #include "wtf/Deque.h"
 #include "wtf/ThreadingPrimitives.h"
 #include <v8.h>
 
 namespace blink {
 
+InspectorTaskRunner::IgnoreInterruptsScope::IgnoreInterruptsScope(InspectorTaskRunner* taskRunner)
+    : m_wasIgnoring(taskRunner->m_ignoreInterrupts)
+    , m_taskRunner(taskRunner)
+{
+    // There may be nested scopes e.g. when tasks are being executed on XHR breakpoint.
+    m_taskRunner->m_ignoreInterrupts = true;
+}
+
+InspectorTaskRunner::IgnoreInterruptsScope::~IgnoreInterruptsScope()
+{
+    m_taskRunner->m_ignoreInterrupts = m_wasIgnoring;
+}
+
 class InspectorTaskRunner::ThreadSafeTaskQueue {
     WTF_MAKE_NONCOPYABLE(ThreadSafeTaskQueue);
 public:
     ThreadSafeTaskQueue() { }
     PassOwnPtr<Task> tryTake()
     {
         MutexLocker lock(m_mutex);
         if (m_queue.isEmpty())
             return nullptr;
         return m_queue.takeFirst();
@@ skipping 38 matching lines @@
 
 void InspectorTaskRunner::v8InterruptCallback(v8::Isolate*, void* data)
 {
     InspectorTaskRunner* runner = static_cast<InspectorTaskRunner*>(data);
     if (runner->m_ignoreInterrupts)
         return;
     runner->runPendingTasks();
 }
 
 }