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

Source/core/inspector/InspectorController.h

Index: Source/core/inspector/InspectorController.h
diff --git a/Source/core/inspector/InspectorController.h b/Source/core/inspector/InspectorController.h
index 42f224add2ada2eb0773c2e5b292ecd6eebbcfbc..95f036886a22e74017bf3d9c75e8c14eb8113118 100644
--- a/Source/core/inspector/InspectorController.h
+++ b/Source/core/inspector/InspectorController.h
@@ -55,6 +55,7 @@ class InspectorState;
 class InstrumentingAgents;
 class IntSize;
 class Page;
+class PlatformGestureEvent;
 class PlatformMouseEvent;
 class PlatformTouchEvent;
 class PostWorkerNotificationToFrontendTask;
@@ -94,6 +95,7 @@ public:
     void hideHighlight();
     Node* highlightedNode() const;
 
+    bool handleGestureEvent(Frame*, const PlatformGestureEvent&);
     bool handleMouseEvent(Frame*, const PlatformMouseEvent&);
     bool handleTouchEvent(Frame*, const PlatformTouchEvent&);