[NetInfo] Add Blink support for connection.change, connection.downlinkMax, and wimax

Source/modules/netinfo/NetworkInformation.cpp

 // Copyright 2014 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 "modules/netinfo/NetworkInformation.h"
 
 #include "core/dom/ExecutionContext.h"
 #include "core/events/Event.h"
 #include "core/page/NetworkStateNotifier.h"
 #include "modules/EventTargetModules.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/text/WTFString.h"
 
 namespace {
 
 using namespace blink;
 
 String connectionTypeToString(WebConnectionType type)
 {
     switch (type) {
     case ConnectionTypeCellular:
         return "cellular";
     case ConnectionTypeBluetooth:
         return "bluetooth";
     case ConnectionTypeEthernet:
         return "ethernet";
     case ConnectionTypeWifi:
         return "wifi";
+    case ConnectionTypeWimax:
+        return "wimax";
     case ConnectionTypeOther:
         return "other";
     case ConnectionTypeNone:
         return "none";
     case ConnectionTypeUnknown:
         return "unknown";
     }
     ASSERT_NOT_REACHED();
     return "none";
 }
@@ skipping 18 matching lines @@
 {
     // m_type is only updated when listening for events, so ask networkStateNotifier
     // if not listening (crbug.com/379841).
     if (!m_observing)
         return connectionTypeToString(networkStateNotifier().connectionType());
 
     // If observing, return m_type which changes when the event fires, per spec.
     return connectionTypeToString(m_type);
 }
 
-void NetworkInformation::connectionTypeChange(WebConnectionType type)
+double NetworkInformation::downlinkMax() const
+{
+    if (!m_observing)
+        return networkStateNotifier().maxBandwidth();
+
+    return m_downlinkMaxMbps;
+}
+
+void NetworkInformation::connectionChange(WebConnectionType type, double downlinkMaxMbps)
 {
     ASSERT(executionContext()->isContextThread());
 
     // This can happen if the observer removes and then adds itself again
     // during notification.
-    if (m_type == type)
+    if (m_type == type && m_downlinkMaxMbps == downlinkMaxMbps)
         return;
 
     m_type = type;
+    m_downlinkMaxMbps = downlinkMaxMbps;
     dispatchEvent(Event::create(EventTypeNames::typechange));
+
+    if (RuntimeEnabledFeatures::netInfoDownlinkMaxEnabled())
+        dispatchEvent(Event::create(EventTypeNames::change));
 }
 
 const AtomicString& NetworkInformation::interfaceName() const
 {
     return EventTargetNames::NetworkInformation;
 }
 
 ExecutionContext* NetworkInformation::executionContext() const
 {
     return ActiveDOMObject::executionContext();
@@ skipping 50 matching lines @@
 {
     if (m_observing) {
         networkStateNotifier().removeObserver(this, executionContext());
         m_observing = false;
     }
 }
 
 NetworkInformation::NetworkInformation(ExecutionContext* context)
     : ActiveDOMObject(context)
     , m_type(networkStateNotifier().connectionType())
+    , m_downlinkMaxMbps(networkStateNotifier().maxBandwidth())
     , m_observing(false)
     , m_contextStopped(false)
 {
 }
 
 DEFINE_TRACE(NetworkInformation)
 {
     RefCountedGarbageCollectedEventTargetWithInlineData<NetworkInformation>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink