Perform direct routing of mouse events when the pointer is locked.

content/browser/web_contents/web_contents_view_mac.h

Index: content/browser/web_contents/web_contents_view_mac.h
diff --git a/content/browser/web_contents/web_contents_view_mac.h b/content/browser/web_contents/web_contents_view_mac.h
index 3b34cbd77178792ae4412a274d3b2acfb2bcbc80..4141b7f55f828327b0a5f149b9070313478e4f74 100644
--- a/content/browser/web_contents/web_contents_view_mac.h
+++ b/content/browser/web_contents/web_contents_view_mac.h
@@ -26,6 +26,7 @@
 
 namespace content {
 class PopupMenuHelper;
+class RenderWidgetHostViewMac;
 class WebContentsImpl;
 class WebContentsViewDelegate;
 class WebContentsViewMac;
@@ -128,6 +129,13 @@ class WebContentsViewMac : public WebContentsView,
   WebContentsImpl* web_contents() { return web_contents_; }
   WebContentsViewDelegate* delegate() { return delegate_.get(); }
 
+  using RenderWidgetHostViewCreateFunction =
+      RenderWidgetHostViewMac* (*)(RenderWidgetHost*, bool);
+
+  // Used to override the creation of RenderWidgetHostViews in tests.
+  CONTENT_EXPORT static void InstallCreateHookForTests(
+      RenderWidgetHostViewCreateFunction create_render_widget_host_view);
+
  private:
   // Returns the fullscreen view, if one exists; otherwise, returns the content
   // native view. This ensures that the view currently attached to a NSWindow is