Add helper class for tests using browser process hit testing

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index b3a7d2462e2dc7f802deab26beb13f362e918d53..1c224f95e85d3a079a44479daba23a0f7b234956 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -344,6 +344,11 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   void SetSelectionControllerClientForTest(
       scoped_ptr<TouchSelectionControllerClientAura> client);
 
+  // Exposed for tests.
+  DelegatedFrameHost* GetDelegatedFrameHostForTesting() const {
+    return GetDelegatedFrameHost();
+  }
+
  protected:
   ~RenderWidgetHostViewAura() override;