Adding DRP specfic UMA for FirstContentfulPaint

content/test/test_web_contents.h

Index: content/test/test_web_contents.h
diff --git a/content/test/test_web_contents.h b/content/test/test_web_contents.h
index 2b52820de059e29606462e1f6fced1b2eca4bece..0b91ff45da20374c85dd4c5464dc1f1f30ebcdd6 100644
--- a/content/test/test_web_contents.h
+++ b/content/test/test_web_contents.h
@@ -14,20 +14,22 @@
 #include "content/test/test_render_frame_host.h"
 #include "content/test/test_render_view_host.h"
 #include "ui/base/page_transition_types.h"
 
 class GURL;
 class Referrer;
 class SiteInstanceImpl;
 
 namespace content {
 
+class NavigationData;
+class NavigationHandle;
 class RenderViewHost;
 class TestRenderViewHost;
 class WebContentsTester;
 
 // Subclass WebContentsImpl to ensure it creates TestRenderViewHosts
 // and does not do anything involving views.
 class TestWebContents : public WebContentsImpl, public WebContentsTester {
  public:
   ~TestWebContents() override;
 
@@ -104,20 +106,24 @@ class TestWebContents : public WebContentsImpl, public WebContentsTester {
   // to |ExpectSetHistoryOffsetAndLength()|.
   void SetHistoryOffsetAndLength(int history_offset,
                                  int history_length) override;
 
   void TestDidFinishLoad(const GURL& url);
   void TestDidFailLoadWithError(const GURL& url,
                                 int error_code,
                                 const base::string16& error_description,
                                 bool was_ignored_by_handler);
 
+  void SetNavigationData(
+      NavigationHandle* navigation_handle,
+      std::unique_ptr<NavigationData> navigation_data) override;
+
  protected:
   // The deprecated WebContentsTester still needs to subclass this.
   explicit TestWebContents(BrowserContext* browser_context);
 
  private:
   // WebContentsImpl overrides
   void CreateNewWindow(
       SiteInstance* source_site_instance,
       int32_t route_id,
       int32_t main_frame_route_id,