Add machinery to show touch editing context menus in OOPIFs.

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index dd984d51f973cfd4a1edb48a4b3539efa1540b06..abd7b2e2a212c5a4a19fec6699259d59efd22081 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -615,6 +615,7 @@ bool RenderWidget::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(InputMsg_SetFocus, OnSetFocus)
     IPC_MESSAGE_HANDLER(InputMsg_SyntheticGestureCompleted,
                         OnSyntheticGestureCompleted)
+    IPC_MESSAGE_HANDLER(ViewMsg_ShowContextMenu, OnShowContextMenu)
     IPC_MESSAGE_HANDLER(ViewMsg_Close, OnClose)
     IPC_MESSAGE_HANDLER(ViewMsg_Resize, OnResize)
     IPC_MESSAGE_HANDLER(ViewMsg_EnableDeviceEmulation,
@@ -1586,6 +1587,18 @@ void RenderWidget::SetPendingWindowRect(const WebRect& rect) {
   }
 }
 
+void RenderWidget::OnShowContextMenu(ui::MenuSourceType source_type,
+                                     const gfx::Point& location) {
+  input_handler_->set_context_menu_source_type(source_type);
+  has_host_context_menu_location_ = true;
+  host_context_menu_location_ = location;
+  if (GetWebWidget()) {
+    GetWebWidget()->ShowContextMenu(
+        static_cast<blink::WebMenuSourceType>(source_type));
+  }
+  has_host_context_menu_location_ = false;
+}
+
 void RenderWidget::OnImeSetComposition(
     const base::string16& text,
     const std::vector<WebCompositionUnderline>& underlines,