Implement pointer lock API for out-of-process iframes.

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index 4035b1067a1d607195262e2c96b66455dd9ed4a5..803955abefc1ce66af71135a06b3aa92fd0a8564 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -478,12 +478,27 @@ void RenderWidgetHostViewChildFrame::ProcessAckedTouchEvent(
 }
 
 bool RenderWidgetHostViewChildFrame::LockMouse() {
+  if (frame_connector_)
+    return frame_connector_->LockMouse();
   return false;
 }
 
 void RenderWidgetHostViewChildFrame::UnlockMouse() {
 }
 
+bool RenderWidgetHostViewChildFrame::IsMouseLocked() {
+  if (!frame_connector_)
+    return false;
+
+  RenderWidgetHostViewBase* root_view =
+      frame_connector_->GetRootRenderWidgetHostView();
+
+  if (root_view)
+    return root_view->IsMouseLocked();
+
+  return false;
+}
+
 uint32_t RenderWidgetHostViewChildFrame::GetSurfaceIdNamespace() {
   return id_allocator_->id_namespace();
 }