DevTools: handle gesture tap event while in inspecting element mode.

Source/web/WebDevToolsAgentImpl.cpp

Index: Source/web/WebDevToolsAgentImpl.cpp
diff --git a/Source/web/WebDevToolsAgentImpl.cpp b/Source/web/WebDevToolsAgentImpl.cpp
index 8d60e2109bba080048e3e0bbe3d30979ce59e6f8..3ea57461e1f04a4afdb6945bace2e56716c7c819 100644
--- a/Source/web/WebDevToolsAgentImpl.cpp
+++ b/Source/web/WebDevToolsAgentImpl.cpp
@@ -464,10 +464,18 @@ void WebDevToolsAgentImpl::webViewResized(const WebSize& size)
 
 bool WebDevToolsAgentImpl::handleInputEvent(WebCore::Page* page, const WebInputEvent& inputEvent)
 {
+    if (!m_attached)
+        return false;
+
     InspectorController* ic = inspectorController();
     if (!ic)
         return false;
 
+    if (WebInputEvent::isGestureEventType(inputEvent.type) && inputEvent.type == WebInputEvent::GestureTap) {
+        // Only let GestureTab in (we only need it and we know PlatformGestureEventBuilder supports it).
+        PlatformGestureEvent gestureEvent = PlatformGestureEventBuilder(page->mainFrame()->view(), *static_cast<const WebGestureEvent*>(&inputEvent));
+        return ic->handleGestureEvent(page->mainFrame(), gestureEvent);
+    }
     if (WebInputEvent::isMouseEventType(inputEvent.type) && inputEvent.type != WebInputEvent::MouseEnter) {
         // PlatformMouseEventBuilder does not work with MouseEnter type, so we filter it out manually.
         PlatformMouseEvent mouseEvent = PlatformMouseEventBuilder(page->mainFrame()->view(), *static_cast<const WebMouseEvent*>(&inputEvent));