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

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 459 matching lines @@
 void RenderWidgetHostViewChildFrame::ProcessAckedTouchEvent(
     const TouchEventWithLatencyInfo& touch,
     InputEventAckState ack_result) {
   if (!frame_connector_)
     return;
 
   frame_connector_->ForwardProcessAckedTouchEvent(touch, ack_result);
 }
 
 bool RenderWidgetHostViewChildFrame::LockMouse() {
+  if (frame_connector_)
+    return frame_connector_->LockMouse();
   return false;
 }
 
 void RenderWidgetHostViewChildFrame::UnlockMouse() {
 }
 
+bool RenderWidgetHostViewChildFrame::IsMouseLocked() {
+  if (frame_connector_) {

[nasko, 2016/05/25 21:12:01]

Why not early return false if !frame_connector_? It removes a level of
indentation.

[lfg, 2016/05/31 21:13:20]

In this case I need two 'return false' since the root_view may be null (though
root_view can only be null in tests).

+    RenderWidgetHostViewBase* root_view =
+        frame_connector_->GetRootRenderWidgetHostView();
+
+    if (root_view)
+      return root_view->IsMouseLocked();
+  }
+
+  return false;
+}
+
 uint32_t RenderWidgetHostViewChildFrame::GetSurfaceIdNamespace() {
   return id_allocator_->id_namespace();
 }
 
 void RenderWidgetHostViewChildFrame::ProcessKeyboardEvent(
     const NativeWebKeyboardEvent& event) {
   host_->ForwardKeyboardEvent(event);
 }
 
 void RenderWidgetHostViewChildFrame::ProcessMouseEvent(
@@ skipping 189 matching lines @@
 
 bool RenderWidgetHostViewChildFrame::IsChildFrameForTesting() const {
   return true;
 }
 
 cc::SurfaceId RenderWidgetHostViewChildFrame::SurfaceIdForTesting() const {
   return surface_id_;
 };
 
 }  // namespace content