Add machinery to show touch editing context menus in OOPIFs.

third_party/WebKit/Source/core/frame/WebFrameWidgetBase.cpp

Index: third_party/WebKit/Source/core/frame/WebFrameWidgetBase.cpp
diff --git a/third_party/WebKit/Source/core/frame/WebFrameWidgetBase.cpp b/third_party/WebKit/Source/core/frame/WebFrameWidgetBase.cpp
index 9ee7908429997bd101b086f9ee7adf0e858f6d18..bbd5e23e2590e8175e55d24bc8f2b2306ea0ca8b 100644
--- a/third_party/WebKit/Source/core/frame/WebFrameWidgetBase.cpp
+++ b/third_party/WebKit/Source/core/frame/WebFrameWidgetBase.cpp
@@ -7,14 +7,17 @@
 #include "core/dom/DocumentUserGestureToken.h"
 #include "core/events/WebInputEventConversion.h"
 #include "core/exported/WebViewBase.h"
+#include "core/frame/ContextMenuAllowedScope.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/VisualViewport.h"
 #include "core/frame/WebLocalFrameBase.h"
 #include "core/input/EventHandler.h"
+#include "core/page/ContextMenuController.h"
 #include "core/page/DragActions.h"
 #include "core/page/DragController.h"
 #include "core/page/DragData.h"
 #include "core/page/DragSession.h"
+#include "core/page/FocusController.h"
 #include "core/page/Page.h"
 #include "core/page/PointerLockController.h"
 #include "platform/UserGestureIndicator.h"
@@ -284,4 +287,17 @@ void WebFrameWidgetBase::PointerLockMouseEvent(const WebInputEvent& event) {
   }
 }
 
+void WebFrameWidgetBase::ShowContextMenu() {
+  if (!GetPage())
+    return;
+
+  GetPage()->GetContextMenuController().ClearContextMenu();
+  {
+    ContextMenuAllowedScope scope;
+    if (LocalFrame* focused_frame =
+            ToLocalFrame(GetPage()->GetFocusController().FocusedOrMainFrame()))
+      focused_frame->GetEventHandler().SendContextMenuEventForKey(nullptr);
+  }
+}
+
 }  // namespace blink