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 214e27b991c2abe945d477c968fd0ca33da13d81..4657b6dd7d70254b792f20ba32628a4b9454b637 100644
--- a/third_party/WebKit/Source/core/frame/WebFrameWidgetBase.cpp
+++ b/third_party/WebKit/Source/core/frame/WebFrameWidgetBase.cpp
@@ -10,11 +10,14 @@
 #include "core/frame/LocalFrameView.h"
 #include "core/frame/VisualViewport.h"
 #include "core/frame/WebLocalFrameBase.h"
+#include "core/input/ContextMenuAllowedScope.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 +287,19 @@ void WebFrameWidgetBase::PointerLockMouseEvent(const WebInputEvent& event) {
   }
 }
 
+void WebFrameWidgetBase::ShowContextMenu(WebMenuSourceType source_type) {
+  if (!GetPage())
+    return;
+
+  GetPage()->GetContextMenuController().ClearContextMenu();
+  {
+    ContextMenuAllowedScope scope;
+    if (LocalFrame* focused_frame =
+            GetPage()->GetFocusController().FocusedFrame()) {
+      focused_frame->GetEventHandler().ShowNonLocatedContextMenu(nullptr,
+                                                                 source_type);
+    }
+  }
+}
+
 }  // namespace blink