Revert of Rename XMLHttpRequestProgressEventThrottle to ProgressEventThrottle

third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp

Index: third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp
diff --git a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..7d3d6b1601d97ef33f408ba151ac3de1cd6f6ac4
--- /dev/null
+++ b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2010 Julien Chaffraix <jchaffraix@webkit.org>  All right reserved.
+ * Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.h"
+
+#include "core/EventTypeNames.h"
+#include "core/events/ProgressEvent.h"
+#include "core/inspector/InspectorInstrumentation.h"
+#include "core/inspector/InspectorTraceEvents.h"
+#include "core/xmlhttprequest/XMLHttpRequest.h"
+#include "wtf/Assertions.h"
+#include "wtf/text/AtomicString.h"
+
+namespace blink {
+
+XMLHttpRequestProgressEventThrottle::DeferredEvent::DeferredEvent()
+{
+    clear();
+}
+
+void XMLHttpRequestProgressEventThrottle::DeferredEvent::set(bool lengthComputable, unsigned long long loaded, unsigned long long total)
+{
+    m_isSet = true;
+
+    m_lengthComputable = lengthComputable;
+    m_loaded = loaded;
+    m_total = total;
+}
+
+void XMLHttpRequestProgressEventThrottle::DeferredEvent::clear()
+{
+    m_isSet = false;
+
+    m_lengthComputable = false;
+    m_loaded = 0;
+    m_total = 0;
+}
+
+PassRefPtrWillBeRawPtr<Event> XMLHttpRequestProgressEventThrottle::DeferredEvent::take()
+{
+    ASSERT(m_isSet);
+
+    RefPtrWillBeRawPtr<Event> event = ProgressEvent::create(EventTypeNames::progress, m_lengthComputable, m_loaded, m_total);
+    clear();
+    return event.release();
+}
+
+const double XMLHttpRequestProgressEventThrottle::minimumProgressEventDispatchingIntervalInSeconds = .05; // 50 ms per specification.
+
+XMLHttpRequestProgressEventThrottle::XMLHttpRequestProgressEventThrottle(XMLHttpRequest* target)
+    : m_target(target)
+    , m_hasDispatchedProgressProgressEvent(false)
+{
+    ASSERT(target);
+}
+
+XMLHttpRequestProgressEventThrottle::~XMLHttpRequestProgressEventThrottle()
+{
+}
+
+void XMLHttpRequestProgressEventThrottle::dispatchProgressEvent(const AtomicString& type, bool lengthComputable, unsigned long long loaded, unsigned long long total)
+{
+    // Given that ResourceDispatcher doesn't deliver an event when suspended,
+    // we don't have to worry about event dispatching while suspended.
+    if (type != EventTypeNames::progress) {
+        m_target->dispatchEvent(ProgressEvent::create(type, lengthComputable, loaded, total));
+        return;
+    }
+
+    if (isActive()) {
+        m_deferred.set(lengthComputable, loaded, total);
+    } else {
+        dispatchProgressProgressEvent(ProgressEvent::create(EventTypeNames::progress, lengthComputable, loaded, total));
+        startOneShot(minimumProgressEventDispatchingIntervalInSeconds, BLINK_FROM_HERE);
+    }
+}
+
+void XMLHttpRequestProgressEventThrottle::dispatchReadyStateChangeEvent(PassRefPtrWillBeRawPtr<Event> event, DeferredEventAction action)
+{
+    XMLHttpRequest::State state = m_target->readyState();
+    // Given that ResourceDispatcher doesn't deliver an event when suspended,
+    // we don't have to worry about event dispatching while suspended.
+    if (action == Flush) {
+        if (m_deferred.isSet())
+            dispatchProgressProgressEvent(m_deferred.take());
+
+        stop();
+    } else if (action == Clear) {
+        m_deferred.clear();
+        stop();
+    }
+
+    m_hasDispatchedProgressProgressEvent = false;
+    if (state == m_target->readyState()) {
+        // We don't dispatch the event when an event handler associated with
+        // the previously dispatched event changes the readyState (e.g. when
+        // the event handler calls xhr.abort()). In such cases a
+        // readystatechange should have been already dispatched if necessary.
+        m_target->dispatchEvent(event);
+    }
+}
+
+void XMLHttpRequestProgressEventThrottle::dispatchProgressProgressEvent(PassRefPtrWillBeRawPtr<Event> progressEvent)
+{
+    XMLHttpRequest::State state = m_target->readyState();
+    if (m_target->readyState() == XMLHttpRequest::LOADING && m_hasDispatchedProgressProgressEvent) {
+        TRACE_EVENT1("devtools.timeline", "XHRReadyStateChange", "data", InspectorXhrReadyStateChangeEvent::data(m_target->executionContext(), m_target));
+        m_target->dispatchEvent(Event::create(EventTypeNames::readystatechange));
+        TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "UpdateCounters", TRACE_EVENT_SCOPE_THREAD, "data", InspectorUpdateCountersEvent::data());
+    }
+
+    if (m_target->readyState() != state)
+        return;
+
+    m_hasDispatchedProgressProgressEvent = true;
+    m_target->dispatchEvent(progressEvent);
+}
+
+void XMLHttpRequestProgressEventThrottle::fired()
+{
+    if (!m_deferred.isSet()) {
+        // No "progress" event was queued since the previous dispatch, we can
+        // safely stop the timer.
+        return;
+    }
+
+    dispatchProgressProgressEvent(m_deferred.take());
+
+    // Watch if another "progress" ProgressEvent arrives in the next 50ms.
+    startOneShot(minimumProgressEventDispatchingIntervalInSeconds, BLINK_FROM_HERE);
+}
+
+void XMLHttpRequestProgressEventThrottle::suspend()
+{
+    stop();
+}
+
+void XMLHttpRequestProgressEventThrottle::resume()
+{
+    if (!m_deferred.isSet())
+        return;
+
+    // Do not dispatch events inline here, since ExecutionContext is iterating
+    // over the list of active DOM objects to resume them, and any activated JS
+    // event-handler could insert new active DOM objects to the list.
+    startOneShot(0, BLINK_FROM_HERE);
+}
+
+DEFINE_TRACE(XMLHttpRequestProgressEventThrottle)
+{
+    visitor->trace(m_target);
+}
+
+} // namespace blink