[Cronet] Pass metrics information from C++ BidirectionalStream to Java

components/cronet/android/cronet_bidirectional_stream_adapter.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_CRONET_ANDROID_CRONET_BIDIRECTIONAL_STREAM_ADAPTER_H_
 #define COMPONENTS_CRONET_ANDROID_CRONET_BIDIRECTIONAL_STREAM_ADAPTER_H_
 
 #include <jni.h>
 
 #include <memory>
@@ skipping 53 matching lines @@
 // or Destroy. Public methods can be called on any thread.
 class CronetBidirectionalStreamAdapter
     : public net::BidirectionalStream::Delegate {
  public:
   static bool RegisterJni(JNIEnv* env);
 
   CronetBidirectionalStreamAdapter(
       CronetURLRequestContextAdapter* context,
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& jbidi_stream,
-      bool jsend_request_headers_automatically);
+      bool jsend_request_headers_automatically,
+      bool enable_metrics);
   ~CronetBidirectionalStreamAdapter() override;
 
   // Validates method and headers, initializes and starts the request. If
   // |jend_of_stream| is true, then stream is half-closed after sending header
   // frame and no data is expected to be written.
   // Returns 0 if request is valid and started successfully,
   // Returns -1 if |jmethod| is not valid HTTP method name.
   // Returns position of invalid header value in |jheaders| if header name is
   // not valid.
   jint Start(JNIEnv* env,
@@ skipping 62 matching lines @@
   void ReadDataOnNetworkThread(
       scoped_refptr<IOBufferWithByteBuffer> read_buffer,
       int buffer_size);
   void WritevDataOnNetworkThread(
       std::unique_ptr<PendingWriteData> pending_write_data);
   void DestroyOnNetworkThread(bool send_on_canceled);
   // Gets headers as a Java array.
   base::android::ScopedJavaLocalRef<jobjectArray> GetHeadersArray(
       JNIEnv* env,
       const net::SpdyHeaderBlock& header_block);
-
+  // Helper method to report metrics to the Java layer.
+  void MaybeReportMetrics();
   CronetURLRequestContextAdapter* const context_;
 
   // Java object that owns this CronetBidirectionalStreamAdapter.
   base::android::ScopedJavaGlobalRef<jobject> owner_;
   const bool send_request_headers_automatically_;
+  // Whether metrics collection is enabled when |this| is created.
+  const bool enable_metrics_;
 
   scoped_refptr<IOBufferWithByteBuffer> read_buffer_;
   std::unique_ptr<PendingWriteData> pending_write_data_;
   std::unique_ptr<net::BidirectionalStream> bidi_stream_;
 
   // Whether BidirectionalStream::Delegate::OnFailed callback is invoked.
   bool stream_failed_;
 
   DISALLOW_COPY_AND_ASSIGN(CronetBidirectionalStreamAdapter);
 };
 
 }  // namespace cronet
 
 #endif  // COMPONENTS_CRONET_ANDROID_CRONET_BIDIRECTIONAL_STREAM_ADAPTER_H_