Adding DRP specfic UMA for FirstContentfulPaint

content/test/test_render_frame_host.cc

Index: content/test/test_render_frame_host.cc
diff --git a/content/test/test_render_frame_host.cc b/content/test/test_render_frame_host.cc
index f158dbcc40fb58a18191d134faa0b39786d2807d..74baa3663a820016f80356d17792763e2fd5f4df 100644
--- a/content/test/test_render_frame_host.cc
+++ b/content/test/test_render_frame_host.cc
@@ -53,21 +53,22 @@ TestRenderFrameHost::TestRenderFrameHost(SiteInstance* site_instance,
                           render_view_host,
                           delegate,
                           rwh_delegate,
                           frame_tree,
                           frame_tree_node,
                           routing_id,
                           widget_routing_id,
                           flags),
       child_creation_observer_(delegate ? delegate->GetAsWebContents() : NULL),
       contents_mime_type_("text/html"),
-      simulate_history_list_was_cleared_(false) {}
+      simulate_history_list_was_cleared_(false),
+      simulate_fetch_via_data_reduction_proxy_(false) {}
 
 TestRenderFrameHost::~TestRenderFrameHost() {
 }
 
 TestRenderViewHost* TestRenderFrameHost::GetRenderViewHost() {
   return static_cast<TestRenderViewHost*>(
       RenderFrameHostImpl::GetRenderViewHost());
 }
 
 MockRenderProcessHost* TestRenderFrameHost::GetProcess() {
@@ -285,20 +286,21 @@ void TestRenderFrameHost::SendNavigateWithParameters(
   params.should_update_history = true;
   params.did_create_new_entry = did_create_new_entry;
   params.gesture = NavigationGestureUser;
   params.contents_mime_type = contents_mime_type_;
   params.is_post = false;
   params.http_status_code = response_code;
   params.socket_address.set_host("2001:db8::1");
   params.socket_address.set_port(80);
   params.history_list_was_cleared = simulate_history_list_was_cleared_;
   params.original_request_url = url_copy;
+  params.used_data_reduction_proxy = simulate_fetch_via_data_reduction_proxy_;
 
   // In most cases, the origin will match the URL's origin.  Tests that need to
   // check corner cases (like about:blank) should specify the origin param
   // manually.
   url::Origin origin(url_copy);
   params.origin = origin;
 
   url::Replacements<char> replacements;
   replacements.ClearRef();
   params.was_within_same_page =