Added Network Quality Estimator Real-time interface to Cronet

components/cronet/android/cronet_url_request_context_adapter.h

Index: components/cronet/android/cronet_url_request_context_adapter.h
diff --git a/components/cronet/android/cronet_url_request_context_adapter.h b/components/cronet/android/cronet_url_request_context_adapter.h
index 3d83f013480659658857edb21599608cc6500648..cbc3e2c9db9f16667e787406f910779ffce58613 100644
--- a/components/cronet/android/cronet_url_request_context_adapter.h
+++ b/components/cronet/android/cronet_url_request_context_adapter.h
@@ -17,11 +17,13 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/json_pref_store.h"
 #include "base/threading/thread.h"
+#include "net/base/network_quality_estimator.h"
 
 class PrefService;
 
 namespace base {
 class SingleThreadTaskRunner;
+class TimeTicks;
 }  // namespace base
 
 namespace net {
@@ -44,12 +46,14 @@ struct URLRequestContextConfig;
 bool CronetUrlRequestContextAdapterRegisterJni(JNIEnv* env);
 
 // Adapter between Java CronetUrlRequestContext and net::URLRequestContext.
-class CronetURLRequestContextAdapter {
+class CronetURLRequestContextAdapter
+    : public net::NetworkQualityEstimator::RTTObserver,
+      public net::NetworkQualityEstimator::ThroughputObserver {
  public:
   explicit CronetURLRequestContextAdapter(
       scoped_ptr<URLRequestContextConfig> context_config);
 
-  ~CronetURLRequestContextAdapter();
+  ~CronetURLRequestContextAdapter() override;
 
   // Called on main Java thread to initialize URLRequestContext.
   void InitRequestContextOnMainThread(JNIEnv* env, jobject jcaller);
@@ -78,6 +82,19 @@ class CronetURLRequestContextAdapter {
   // Called on main Java thread to initialize URLRequestContext.
   void InitRequestContextOnMainThread();
 
+  // Enables the network quality estimator and optionally configures it to
+  // observe localhost requests, and to consider smaller responses when
+  // observing throughput. It is recommended that both options be set to false.
+  void EnableNetworkQualityEstimator(JNIEnv* env,
+                                     jobject jcaller,
+                                     jboolean use_local_host_requests,
+                                     jboolean use_smaller_responses);
+
+  // Request that RTT and/or throughput observations should or should not be
+  // provided by the network quality estimator.
+  void ProvideRTTObservations(JNIEnv* env, jobject jcaller, bool should);
+  void ProvideThroughputObservations(JNIEnv* env, jobject jcaller, bool should);
+
  private:
   // Initializes |context_| on the Network thread.
   void InitializeOnNetworkThread(scoped_ptr<URLRequestContextConfig> config,
@@ -99,6 +116,29 @@ class CronetURLRequestContextAdapter {
   // Gets the file thread. Create one if there is none.
   base::Thread* GetFileThread();
 
+  // Instantiate and configure the network quality estimator. For default
+  // behavior, parameters should be set to false; otherwise the estimator
+  // can be configured to observe requests to localhost, as well as to use
+  // observe smaller responses when estimating throughput.
+  void EnableNetworkQualityEstimatorOnNetworkThread(
+      bool use_local_host_requests,
+      bool use_smaller_responses);
+
+  void ProvideRTTObservationsOnNetworkThread(bool should);
+  void ProvideThroughputObservationsOnNetworkThread(bool should);
+
+  // net::NetworkQualityEstimator::RTTObserver implementation.
+  void OnRTTObservation(
+      int32_t rtt_ms,
+      const base::TimeTicks& timestamp,
+      net::NetworkQualityEstimator::ObservationSource source) override;
+
+  // net::NetworkQualityEstimator::ThroughputObserver implementation.
+  void OnThroughputObservation(
+      int32_t throughput_kbps,
+      const base::TimeTicks& timestamp,
+      net::NetworkQualityEstimator::ObservationSource source) override;
+
   // Network thread is owned by |this|, but is destroyed from java thread.
   base::Thread* network_thread_;
 
@@ -131,6 +171,12 @@ class CronetURLRequestContextAdapter {
   bool is_context_initialized_;
   int default_load_flags_;
 
+  // A network quality estimator.
+  scoped_ptr<net::NetworkQualityEstimator> network_quality_estimator_;
+
+  // Java object that owns this CronetURLRequestContextAdapter.
+  base::android::ScopedJavaGlobalRef<jobject> jcronet_url_request_context_;
+
 #if defined(DATA_REDUCTION_PROXY_SUPPORT)
   scoped_ptr<CronetDataReductionProxy> data_reduction_proxy_;
 #endif