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..adf15ea8274d3a1988841bd227a2f4d32b0609eb 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 = ToLocalFrame(
+            GetPage()->GetFocusController().FocusedOrMainFrame())) {

[dcheng, 2017/05/26 17:18:45]

I think this should only be calling FocusedFrame()--if there's some IPC race
that causes the focused frame to be null, I don't think we want to fall back to
the main frame by default. This will also remove the need to downcast.

(Looking through this file, it looks like a more systemic issue that we should
fix)

+      focused_frame->GetEventHandler().ShowNonLocatedContextMenu(nullptr,
+                                                                 source_type);
+    }
+  }
+}
+
 }  // namespace blink