Adding DRP specfic UMA for FirstContentfulPaint

content/public/test/test_renderer_host.cc

Index: content/public/test/test_renderer_host.cc
diff --git a/content/public/test/test_renderer_host.cc b/content/public/test/test_renderer_host.cc
index 25352991dbb3ade3b71721c937b9f7004ae733c5..fd66c82f28119ba069408a03da5397f791fd37ab 100644
--- a/content/public/test/test_renderer_host.cc
+++ b/content/public/test/test_renderer_host.cc
@@ -155,20 +155,26 @@ WebContents* RenderViewHostTestHarness::CreateTestWebContents() {
   SiteInstance* instance = SiteInstance::Create(browser_context_.get());
   instance->GetProcess()->Init();
 
   return TestWebContents::Create(browser_context_.get(), instance);
 }
 
 void RenderViewHostTestHarness::NavigateAndCommit(const GURL& url) {
   static_cast<TestWebContents*>(web_contents())->NavigateAndCommit(url);
 }
 
+void RenderViewHostTestHarness::SetSimulateUsedDataReductionProxy(
+    bool enabled) {
+  static_cast<TestWebContents*>(web_contents())
+      ->set_simulate_used_data_reduction_proxy(enabled);
+}
+
 void RenderViewHostTestHarness::Reload() {
   NavigationEntry* entry = controller().GetLastCommittedEntry();
   DCHECK(entry);
   controller().Reload(false);
   RenderFrameHostTester::For(main_rfh())
       ->SendNavigateWithTransition(entry->GetPageID(), entry->GetUniqueID(),
                                    false, entry->GetURL(),
                                    ui::PAGE_TRANSITION_RELOAD);
 }