Allow out-of-process iframes to update the mouse cursor

content/browser/frame_host/cross_process_frame_connector.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/cross_process_frame_connector.h"
 
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/compositor/surface_utils.h"
+#include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/render_frame_host_manager.h"
 #include "content/browser/frame_host/render_frame_proxy_host.h"
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/common/frame_messages.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
@@ skipping 136 matching lines @@
     DCHECK(frame_proxy_in_parent_renderer_->frame_tree_node()->IsMainFrame());
     return;
   }
 
   RenderWidgetHostView* rwhv =
       frame_proxy_in_parent_renderer_->GetRenderWidgetHostView();
   if (rwhv)
     static_cast<RenderWidgetHostViewBase*>(rwhv)->GetScreenInfo(results);
 }
 
+void CrossProcessFrameConnector::UpdateCursor(const WebCursor& cursor) {
+  RenderWidgetHostViewBase* root_view = GetRootRenderWidgetHostView();
+  if (root_view)
+    root_view->UpdateCursor(cursor);
+}
+
 void CrossProcessFrameConnector::OnForwardInputEvent(
     const blink::WebInputEvent* event) {
   if (!view_)
     return;
 
   RenderFrameHostManager* manager =
       frame_proxy_in_parent_renderer_->frame_tree_node()->render_manager();
   RenderWidgetHostImpl* parent_widget =
       manager->ForInnerDelegate()
           ? manager->GetOuterRenderWidgetHostForKeyboardInput()
@@ skipping 35 matching lines @@
     child_widget->NotifyScreenInfoChanged();
   }
 }
 
 void CrossProcessFrameConnector::SetSize(gfx::Rect frame_rect) {
   child_frame_rect_ = frame_rect;
   if (view_)
     view_->SetSize(frame_rect.size());
 }
 
+RenderWidgetHostViewBase*
+CrossProcessFrameConnector::GetRootRenderWidgetHostView() {
+  return static_cast<RenderWidgetHostViewBase*>(
+      frame_proxy_in_parent_renderer_->frame_tree_node()
+          ->frame_tree()
+          ->root()
+          ->current_frame_host()
+          ->GetView());

[nasko, 2015/10/15 17:06:54]

What happens with <webview> where the root RWHV is not at the inner WebContents,
but the outer? I think in that case we have a RWHVChildFrame, which will do
another hop through its own frame connector, right?

[kenrb, 2015/10/15 17:12:54]

Yes.

+}
+
 }  // namespace content