Adding DRP specfic UMA for FirstContentfulPaint

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index 05a6a947aa783bfdd0f5ef0c3cee5da09ad343f7..99623620861fa27dbbd13e2b521c5cfba406775f 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -1,19 +1,21 @@
 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/navigation_handle_impl.h"
 
 #include <utility>
 
+#include "base/supports_user_data.h"
 #include "content/browser/frame_host/frame_tree_node.h"
+#include "content/browser/frame_host/navigation_user_data.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/browser/frame_host/navigator_delegate.h"
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
 #include "content/browser/service_worker/service_worker_navigation_handle.h"
 #include "content/common/frame_messages.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/common/content_client.h"
 #include "net/url_request/redirect_info.h"
 
@@ -58,21 +60,22 @@ NavigationHandleImpl::NavigationHandleImpl(
       render_frame_host_(nullptr),
       is_same_page_(false),
       is_synchronous_(is_synchronous),
       is_srcdoc_(is_srcdoc),
       was_redirected_(false),
       state_(INITIAL),
       is_transferring_(false),
       frame_tree_node_(frame_tree_node),
       next_index_(0),
       navigation_start_(navigation_start),
-      pending_nav_entry_id_(pending_nav_entry_id) {
+      pending_nav_entry_id_(pending_nav_entry_id),
+      navigation_supports_user_data_(nullptr) {
   DCHECK(!navigation_start.is_null());
   GetDelegate()->DidStartNavigation(this);
 }
 
 NavigationHandleImpl::~NavigationHandleImpl() {
   GetDelegate()->DidFinishNavigation(this);
 
   // Cancel the navigation on the IO thread if the NavigationHandle is being
   // destroyed in the middle of the NavigationThrottles checks.
   if (!IsBrowserSideNavigationEnabled() && !complete_callback_.is_null())
@@ -483,11 +486,24 @@ void NavigationHandleImpl::RunCompleteCallback(
   ThrottleChecksFinishedCallback callback = complete_callback_;
   complete_callback_.Reset();
 
   if (!callback.is_null())
     callback.Run(result);
 
   // No code after running the callback, as it might have resulted in our
   // destruction.
 }
 
+void NavigationHandleImpl::SetNavigationSupportsUserData(
+    scoped_ptr<NavigationSupportsUserData> navigation_supports_user_data) {
+  DCHECK(!navigation_supports_user_data_.get());
+  navigation_supports_user_data_ = std::move(navigation_supports_user_data);
+}
+
+base::SupportsUserData::Data* NavigationHandleImpl::GetUserData(
+    const void* key) {
+  if (navigation_supports_user_data_.get())
+    return navigation_supports_user_data_->GetUserData(key);
+  return nullptr;
+}
+
 }  // namespace content