Fixed the audio backgrounding bug

content/public/test/mock_render_process_host.cc

Index: content/public/test/mock_render_process_host.cc
diff --git a/content/public/test/mock_render_process_host.cc b/content/public/test/mock_render_process_host.cc
index b988309d1519e42b6e99f9c31e559a8e4441bb5a..044527fe98de6b530bf97f4ede4f0213d85eedad 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -138,6 +138,8 @@ int MockRenderProcessHost::VisibleWidgetCount() const {
   return 1;
 }
 
+void MockRenderProcessHost::AudioStateChanged() {}
+
 bool MockRenderProcessHost::IsForGuestsOnly() const {
   return is_for_guests_only_;
 }
@@ -282,6 +284,13 @@ media::BrowserCdm* MockRenderProcessHost::GetBrowserCdm(int render_frame_id,
 }
 #endif
 
+#if defined(OS_MACOSX)
+mach_port_t MockRenderProcessHost::GetMachTaskPortForTesting() const {
+  mach_port_t port = 0;
+  return port;

[Robert Sesek, 2015/08/24 21:44:48]

return MACH_PORT_NULL;

[sebsg, 2015/08/25 01:35:59]

Done.

+}
+#endif
+
 void MockRenderProcessHost::FilterURL(bool empty_allowed, GURL* url) {
   RenderProcessHostImpl::FilterURL(this, empty_allowed, url);
 }