Implement timing metrics for UrlRequest

components/cronet/android/cronet_url_request_adapter.h

Index: components/cronet/android/cronet_url_request_adapter.h
diff --git a/components/cronet/android/cronet_url_request_adapter.h b/components/cronet/android/cronet_url_request_adapter.h
index b8c2d102e4e2ff85138d01e5bc5ef0c65c8b001b..b0670a70483d2f13007b7123251a0a641858d076 100644
--- a/components/cronet/android/cronet_url_request_adapter.h
+++ b/components/cronet/android/cronet_url_request_adapter.h
@@ -18,6 +18,7 @@
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/time/time.h"
 #include "net/base/request_priority.h"
 #include "net/url_request/url_request.h"
 #include "url/gurl.h"
@@ -60,7 +61,8 @@ class CronetURLRequestAdapter : public net::URLRequest::Delegate {
                           const GURL& url,
                           net::RequestPriority priority,
                           jboolean jdisable_cache,
-                          jboolean jdisable_connection_migration);
+                          jboolean jdisable_connection_migration,
+                          jboolean jenable_metrics);
   ~CronetURLRequestAdapter() override;
 
   // Methods called prior to Start are never called on network thread.
@@ -137,7 +139,9 @@ class CronetURLRequestAdapter : public net::URLRequest::Delegate {
   void DestroyOnNetworkThread(bool send_on_canceled);
 
   // Report error and cancel request_adapter.
-  void ReportError(net::URLRequest* request, int net_error) const;
+  void ReportError(net::URLRequest* request, int net_error);
+  // Reports metrics collected to the Java layer
+  void MaybeReportMetrics(JNIEnv* env) const;
 
   CronetURLRequestContextAdapter* context_;
 
@@ -154,6 +158,12 @@ class CronetURLRequestAdapter : public net::URLRequest::Delegate {
   scoped_refptr<IOBufferWithByteBuffer> read_buffer_;
   std::unique_ptr<net::URLRequest> url_request_;
 
+  // Whether detailed metrics should be collected and reported to Java for this
+  // request.
+  const bool enable_metrics_;
+  // Time when the request finished
+  base::TimeTicks end_time_;
+
   DISALLOW_COPY_AND_ASSIGN(CronetURLRequestAdapter);
 };