[DevTools] Disable touch emulation on devices with touch input.

Source/core/inspector/InspectorPageAgent.cpp

Index: Source/core/inspector/InspectorPageAgent.cpp
diff --git a/Source/core/inspector/InspectorPageAgent.cpp b/Source/core/inspector/InspectorPageAgent.cpp
index e01e26537b1821f181ab687d64dc7f8311da7fb1..dca6a0a50e187454abaf751379c4779161e9a673 100644
--- a/Source/core/inspector/InspectorPageAgent.cpp
+++ b/Source/core/inspector/InspectorPageAgent.cpp
@@ -342,6 +342,7 @@ InspectorPageAgent::InspectorPageAgent(Page* page, InjectedScriptManager* inject
     , m_ignoreScriptsEnabledNotification(false)
     , m_deviceMetricsOverridden(false)
     , m_emulateViewportEnabled(false)
+    , m_embedderDeviceSupportsTouch(false)
     , m_embedderTextAutosizingEnabled(m_page->settings().textAutosizingEnabled())
     , m_embedderFontScaleFactor(m_page->settings().deviceScaleAdjustment())
 {
@@ -1161,13 +1162,28 @@ void InspectorPageAgent::updateViewMetrics(int width, int height, double deviceS
 void InspectorPageAgent::updateTouchEventEmulationInPage(bool enabled)
 {
     m_state->setBoolean(PageAgentState::touchEventEmulationEnabled, enabled);
+    if (enabled)
+        m_embedderDeviceSupportsTouch = m_page->settings().deviceSupportsTouch();
     m_client->setTouchEventEmulationEnabled(enabled);
 }
 
-void InspectorPageAgent::setTouchEmulationEnabled(ErrorString*, bool enabled)
+void InspectorPageAgent::hasTouchInputs(ErrorString*, bool* result)
+{
+    if (m_state->getBoolean(PageAgentState::touchEventEmulationEnabled))
+        *result = m_embedderDeviceSupportsTouch;
+    else
+        *result = m_page->settings().deviceSupportsTouch();
+}
+
+void InspectorPageAgent::setTouchEmulationEnabled(ErrorString* error, bool enabled)
 {
     if (m_state->getBoolean(PageAgentState::touchEventEmulationEnabled) == enabled)
         return;
+    if (enabled && m_page->settings().deviceSupportsTouch()) {
+        if (error)
+            *error = "Device already supports touch input";
+        return;
+    }
     updateTouchEventEmulationInPage(enabled);
 }