Add ProcessPowerCollector to audit power information.

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 1f5de5f22faadcfe9467e5f2366cbe667662a694..a59ce5fb3730f522e9122a9f2d71bbb1fef5bec0 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -122,6 +122,8 @@ void MockRenderProcessHost::DumpHandles() {
 base::ProcessHandle MockRenderProcessHost::GetHandle() const {
   // Return the current-process handle for the IPC::GetFileHandleForProcess
   // function.
+  if (process_handle)
+    return *process_handle;
   return base::Process::Current().handle();
 }