Record data use of user traffic by different core page transition types

components/data_use_measurement/content/content_url_request_classifier.cc

Index: components/data_use_measurement/content/content_url_request_classifier.cc
diff --git a/components/data_use_measurement/content/content_url_request_classifier.cc b/components/data_use_measurement/content/content_url_request_classifier.cc
index 23bbd8baa9624a0515bfab3b4bf2026ab5e4243a..35d7ac575fa7c0b7c50721b42c92417d364b6ba3 100644
--- a/components/data_use_measurement/content/content_url_request_classifier.cc
+++ b/components/data_use_measurement/content/content_url_request_classifier.cc
@@ -4,8 +4,36 @@
 
 #include "components/data_use_measurement/content/content_url_request_classifier.h"
 
+#include "base/metrics/histogram_macros.h"
+#include "base/metrics/sparse_histogram.h"
 #include "content/public/browser/resource_request_info.h"
 #include "net/url_request/url_request.h"
+#include "ui/base/page_transition_types.h"
+
+namespace {
+
+// Data use broken by page transition type. This enum must remain synchronized
+// with the enum of the same name in metrics/histograms/histograms.xml. The enum
+// values have the same meaning as ui::PageTransition in
+// ui/base/page_transition_types.h. These values are written to logs.  New enum
+// values can be added, but existing enums must never be renumbered or deleted
+// and reused.
+enum DataUsePageTransition {
+  LINK = 0,
+  TYPED = 1,
+  AUTO_BOOKMARK = 2,
+  SUBFRAME = 3,  // AUTO_SUBFRAME and MANUAL_SUBFRAME transitions.
+  GENERATED = 4,
+  AUTO_TOPLEVEL = 5,
+  FORM_SUBMIT = 6,
+  RELOAD = 7,
+  KEYWORD = 8,  // KEYWORD and KEYWORD_GENERATED transitions.
+  FORWARD_BACK = 9,
+  HOME_PAGE = 10,
+  TRANSITION_MAX = 11,
+};
+
+}  // namespace
 
 namespace data_use_measurement {
 
@@ -26,4 +54,63 @@ bool ContentURLRequestClassifier::IsUserRequest(
   return data_use_measurement::IsUserRequest(request);
 }
 
+void ContentURLRequestClassifier::RecordPageTransitionUMA(
+    uint64_t page_transition,
+    int64_t received_bytes) const {
+  DataUsePageTransition data_use_page_transition =
+      DataUsePageTransition::TRANSITION_MAX;
+  if (received_bytes <= 0)
+    return;
+
+  if (page_transition & ui::PAGE_TRANSITION_FORWARD_BACK) {
+    data_use_page_transition = DataUsePageTransition::FORWARD_BACK;
+  } else if (page_transition & ui::PAGE_TRANSITION_HOME_PAGE) {
+    data_use_page_transition = DataUsePageTransition::HOME_PAGE;
+  } else {
+    switch (page_transition & ui::PAGE_TRANSITION_CORE_MASK) {
+      case ui::PAGE_TRANSITION_LINK:
+        data_use_page_transition = DataUsePageTransition::LINK;
+        break;
+      case ui::PAGE_TRANSITION_TYPED:
+        data_use_page_transition = DataUsePageTransition::TYPED;
+        break;
+      case ui::PAGE_TRANSITION_AUTO_BOOKMARK:
+        data_use_page_transition = DataUsePageTransition::AUTO_BOOKMARK;
+        break;
+      case ui::PAGE_TRANSITION_AUTO_SUBFRAME:
+      case ui::PAGE_TRANSITION_MANUAL_SUBFRAME:
+        data_use_page_transition = DataUsePageTransition::SUBFRAME;
+        break;
+      case ui::PAGE_TRANSITION_GENERATED:
+        data_use_page_transition = DataUsePageTransition::GENERATED;
+        break;
+      case ui::PAGE_TRANSITION_AUTO_TOPLEVEL:
+        data_use_page_transition = DataUsePageTransition::AUTO_TOPLEVEL;
+        break;
+      case ui::PAGE_TRANSITION_FORM_SUBMIT:
+        data_use_page_transition = DataUsePageTransition::FORM_SUBMIT;
+        break;
+      case ui::PAGE_TRANSITION_RELOAD:
+        data_use_page_transition = DataUsePageTransition::RELOAD;
+        break;
+      case ui::PAGE_TRANSITION_KEYWORD:
+      case ui::PAGE_TRANSITION_KEYWORD_GENERATED:
+        data_use_page_transition = DataUsePageTransition::KEYWORD;
+        break;
+    }
+  }
+  DCHECK_NE(DataUsePageTransition::TRANSITION_MAX, data_use_page_transition);
+
+  // Use the more primitive STATIC_HISTOGRAM_POINTER_BLOCK macro because the
+  // simple UMA_HISTOGRAM_ENUMERATION macros don't expose 'AddCount'.
+  STATIC_HISTOGRAM_POINTER_BLOCK(
+      "DataUse.PageTransition.UserTraffic",
+      AddCount(data_use_page_transition, received_bytes),
+      base::LinearHistogram::FactoryGet(
+          "DataUse.PageTransition.UserTraffic", 1,
+          DataUsePageTransition::TRANSITION_MAX,
+          DataUsePageTransition::TRANSITION_MAX + 1,
+          base::HistogramBase::kUmaTargetedHistogramFlag));
+}
+
 }  // namespace data_use_measurement