Add ProcessPowerCollector to audit power information.

content/public/test/mock_render_process_host.h

Index: content/public/test/mock_render_process_host.h
diff --git a/content/public/test/mock_render_process_host.h b/content/public/test/mock_render_process_host.h
index 634017094921913ac039d8e371e61ad52d405a76..654b513fd863e19f44152997a28e5de812296818 100644
--- a/content/public/test/mock_render_process_host.h
+++ b/content/public/test/mock_render_process_host.h
@@ -103,6 +103,10 @@ class MockRenderProcessHost : public RenderProcessHost {
     is_isolated_guest_ = is_isolated_guest;
   }
 
+  void SetProcessHandle(int new_handle) {
+    process_handle.reset(new int(new_handle));
+  }
+
  private:
   // Stores IPC messages that would have been sent to the renderer.
   IPC::TestSink sink_;
@@ -118,6 +122,7 @@ class MockRenderProcessHost : public RenderProcessHost {
   bool fast_shutdown_started_;
   bool deletion_callback_called_;
   bool is_isolated_guest_;
+  scoped_ptr<int> process_handle;
 
   DISALLOW_COPY_AND_ASSIGN(MockRenderProcessHost);
 };