[DevTools] Change navigator.maxTouchPoints when emulating touch.

Source/core/inspector/InspectorPageAgent.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 389 matching lines @@
     , m_overlay(overlay)
     , m_lastScriptIdentifier(0)
     , m_enabled(false)
     , m_ignoreScriptsEnabledNotification(false)
     , m_deviceMetricsOverridden(false)
     , m_emulateMobileEnabled(false)
     , m_touchEmulationEnabled(false)
     , m_originalTouchEnabled(false)
     , m_originalDeviceSupportsMouse(false)
     , m_originalDeviceSupportsTouch(false)
+    , m_originalMaxTouchPoints(0)
     , m_embedderTextAutosizingEnabled(m_page->settings().textAutosizingEnabled())
     , m_embedderFontScaleFactor(m_page->settings().deviceScaleAdjustment())
 {
 }
 
 void InspectorPageAgent::setTextAutosizingEnabled(bool enabled)
 {
     m_embedderTextAutosizingEnabled = enabled;
     bool emulateMobileEnabled = m_enabled && m_deviceMetricsOverridden && m_emulateMobileEnabled;
     if (!emulateMobileEnabled)
@@ skipping 905 matching lines @@
     m_client->setShowFPSCounter(m_state->getBoolean(PageAgentState::pageAgentShowFPSCounter) && !m_deviceMetricsOverridden);
     m_client->setContinuousPaintingEnabled(m_state->getBoolean(PageAgentState::pageAgentContinuousPaintingEnabled) && !m_deviceMetricsOverridden);
 }
 
 void InspectorPageAgent::updateTouchEventEmulationInPage(bool enabled)
 {
     if (!m_touchEmulationEnabled) {
         m_originalTouchEnabled = RuntimeEnabledFeatures::touchEnabled();
         m_originalDeviceSupportsMouse = m_page->settings().deviceSupportsMouse();
         m_originalDeviceSupportsTouch = m_page->settings().deviceSupportsTouch();
+        m_originalMaxTouchPoints = m_page->settings().maxTouchPoints();
     }
     RuntimeEnabledFeatures::setTouchEnabled(enabled ? true : m_originalTouchEnabled);
     if (!m_originalDeviceSupportsTouch) {
         m_page->settings().setDeviceSupportsMouse(enabled ? false : m_originalDeviceSupportsMouse);
         m_page->settings().setDeviceSupportsTouch(enabled ? true : m_originalDeviceSupportsTouch);
+        // Currently emulation does not provide multiple touch points.
+        m_page->settings().setMaxTouchPoints(enabled ? 1 : m_originalMaxTouchPoints);
     }
     m_touchEmulationEnabled = enabled;
     m_client->setTouchEventEmulationEnabled(enabled);
     m_page->deprecatedLocalMainFrame()->view()->layout();
 }
 
 void InspectorPageAgent::setTouchEmulationEnabled(ErrorString*, bool enabled)
 {
     if (m_state->getBoolean(PageAgentState::touchEventEmulationEnabled) == enabled)
         return;
@@ skipping 75 matching lines @@
 
 void InspectorPageAgent::trace(Visitor* visitor)
 {
     visitor->trace(m_page);
     visitor->trace(m_injectedScriptManager);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink