Add a way to send the resource percentage signal to the RC.

chrome/browser/page_load_metrics/page_load_metrics_initialize.cc

Index: chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc b/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
index 5b9d15cd189b2a26c44e462b9e9f85a65a74cab7..420d7691807b5fa15fc21412b0c8a3b2e2fa3bb4 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
+++ b/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
@@ -29,6 +29,7 @@
 #include "chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/protocol_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.h"
+#include "chrome/browser/page_load_metrics/observers/resource_tracking_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/tab_restore_page_load_metrics_observer.h"
@@ -38,6 +39,8 @@
 #include "chrome/browser/prerender/prerender_contents.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/search.h"
+#include "components/offline_pages/core/background/offliner.h"
+#include "components/offline_pages/features/features.h"
 #include "components/rappor/rappor_service_impl.h"
 #include "content/public/browser/web_contents.h"
 #include "url/gurl.h"
@@ -49,7 +52,8 @@ namespace {
 class PageLoadMetricsEmbedder
     : public page_load_metrics::PageLoadMetricsEmbedderInterface {
  public:
-  explicit PageLoadMetricsEmbedder(content::WebContents* web_contents);
+  explicit PageLoadMetricsEmbedder(content::WebContents* web_contents,
+                                   bool background_rendering);
   ~PageLoadMetricsEmbedder() override;
 
   // page_load_metrics::PageLoadMetricsEmbedderInterface:
@@ -60,19 +64,23 @@ class PageLoadMetricsEmbedder
   bool IsPrerendering() const;
 
   content::WebContents* const web_contents_;
+  // true  when rendering in the background, such as creating an offline page.
+  bool background_rendering_;
 
   DISALLOW_COPY_AND_ASSIGN(PageLoadMetricsEmbedder);
 };
 
 PageLoadMetricsEmbedder::PageLoadMetricsEmbedder(
-    content::WebContents* web_contents)
-    : web_contents_(web_contents) {}
+    content::WebContents* web_contents,
+    bool background_rendering)
+    : web_contents_(web_contents),
+      background_rendering_(background_rendering) {}
 
 PageLoadMetricsEmbedder::~PageLoadMetricsEmbedder() {}
 
 void PageLoadMetricsEmbedder::RegisterObservers(
     page_load_metrics::PageLoadTracker* tracker) {
-  if (!IsPrerendering()) {
+  if (!IsPrerendering() && !background_rendering_) {
     tracker->AddObserver(base::MakeUnique<AbortsPageLoadMetricsObserver>());
     tracker->AddObserver(base::MakeUnique<AMPPageLoadMetricsObserver>());
     tracker->AddObserver(base::MakeUnique<CorePageLoadMetricsObserver>());
@@ -135,6 +143,13 @@ void PageLoadMetricsEmbedder::RegisterObservers(
       base::MakeUnique<OmniboxSuggestionUsedMetricsObserver>(IsPrerendering()));
   tracker->AddObserver(
       base::MakeUnique<DelayNavigationPageLoadMetricsObserver>());
+#if BUILDFLAG(ENABLE_OFFLINE_PAGES)
+  if (background_rendering_) {
+    tracker->AddObserver(
+        base::MakeUnique<
+            page_load_metrics::ResourceTrackingPageLoadMetricsObserver>());
+  }
+#endif  // ENABLE_OFFLINE_PAGES
 }
 
 bool PageLoadMetricsEmbedder::IsPrerendering() const {
@@ -152,10 +167,11 @@ bool PageLoadMetricsEmbedder::IsNewTabPageUrl(const GURL& url) {
 
 }  // namespace
 
-void InitializePageLoadMetricsForWebContents(
-    content::WebContents* web_contents) {
+void InitializePageLoadMetricsForWebContents(content::WebContents* web_contents,
+                                             bool background_rendering) {
   page_load_metrics::MetricsWebContentsObserver::CreateForWebContents(
-      web_contents, base::MakeUnique<PageLoadMetricsEmbedder>(web_contents));
+      web_contents, base::MakeUnique<PageLoadMetricsEmbedder>(
+                        web_contents, background_rendering));
 }
 
 }  // namespace chrome