Support tooltips in GuestViews with "--use-cross-process-frames-for-guests" flag.

content/browser/frame_host/render_widget_host_view_child_frame.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 276 matching lines @@
   // RenderWidgetHostInputEventRouter afterwards.
   NotifyObserversAboutShutdown();
 
   host_->SetView(nullptr);
   host_ = nullptr;
   base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
 }
 
 void RenderWidgetHostViewChildFrame::SetTooltipText(
     const base::string16& tooltip_text) {
+  frame_connector_->GetRootRenderWidgetHostView()->SetTooltipText(tooltip_text);
 }
 
 void RenderWidgetHostViewChildFrame::SelectionChanged(
     const base::string16& text,
     size_t offset,
     const gfx::Range& range) {
 }
 
 void RenderWidgetHostViewChildFrame::SelectionBoundsChanged(
     const ViewHostMsg_SelectionBounds_Params& params) {
@@ skipping 378 matching lines @@
 
 bool RenderWidgetHostViewChildFrame::IsChildFrameForTesting() const {
   return true;
 }
 
 cc::SurfaceId RenderWidgetHostViewChildFrame::SurfaceIdForTesting() const {
   return surface_id_;
 };
 
 }  // namespace content