Coalesce small buffers in net::BidirectionalStream

components/cronet/android/cronet_bidirectional_stream_adapter.h

Index: components/cronet/android/cronet_bidirectional_stream_adapter.h
diff --git a/components/cronet/android/cronet_bidirectional_stream_adapter.h b/components/cronet/android/cronet_bidirectional_stream_adapter.h
index 82a402bcc4a912b674a60bc7c74a28538d22aaa4..890ab91ee6b31f9d568a88ef64a58d00cc312cae 100644
--- a/components/cronet/android/cronet_bidirectional_stream_adapter.h
+++ b/components/cronet/android/cronet_bidirectional_stream_adapter.h
@@ -43,7 +43,8 @@ class CronetBidirectionalStreamAdapter
   CronetBidirectionalStreamAdapter(
       CronetURLRequestContextAdapter* context,
       JNIEnv* env,
-      const base::android::JavaParamRef<jobject>& jbidi_stream);
+      const base::android::JavaParamRef<jobject>& jbidi_stream,
+      bool jdisable_auto_flush);
   ~CronetBidirectionalStreamAdapter() override;
 
   // Validates method and headers, initializes and starts the request. If
@@ -81,6 +82,14 @@ class CronetBidirectionalStreamAdapter
                      jint jlimit,
                      jboolean jend_of_stream);
 
+  jboolean WritevData(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& jcaller,
+      const base::android::JavaParamRef<jobjectArray>& jbyte_buffers,
+      const base::android::JavaParamRef<jintArray>& jpositions,
+      const base::android::JavaParamRef<jintArray>& jlimits,
+      jboolean jend_of_stream);
+
   // Releases all resources for the request and deletes the object itself.
   // |jsend_on_canceled| indicates if Java onCanceled callback should be
   // issued to indicate that no more callbacks will be issued.
@@ -89,8 +98,9 @@ class CronetBidirectionalStreamAdapter
                jboolean jsend_on_canceled);
 
  private:
+  typedef std::vector<scoped_refptr<IOBufferWithByteBuffer>> IOByteBufferList;
   // net::BidirectionalStream::Delegate implementations:
-  void OnHeadersSent() override;
+  void OnStreamReady() override;
   void OnHeadersReceived(const net::SpdyHeaderBlock& response_headers) override;
   void OnDataRead(int bytes_read) override;
   void OnDataSent() override;
@@ -104,8 +114,9 @@ class CronetBidirectionalStreamAdapter
       int buffer_size);
   void WriteDataOnNetworkThread(
       scoped_refptr<IOBufferWithByteBuffer> read_buffer,
-      int buffer_size,
       bool end_of_stream);
+  void WritevDataOnNetworkThread(const IOByteBufferList& buffers,
+                                 bool end_of_stream);
   void DestroyOnNetworkThread(bool send_on_canceled);
   // Gets headers as a Java array.
   base::android::ScopedJavaLocalRef<jobjectArray> GetHeadersArray(
@@ -116,9 +127,14 @@ class CronetBidirectionalStreamAdapter
 
   // Java object that owns this CronetBidirectionalStreamAdapter.
   base::android::ScopedJavaGlobalRef<jobject> owner_;
+  const bool disable_auto_flush_;
+  // Whether an end of stream flag is passed in through a write call.
+  // Not applicable to HTTP methods that do not send data.
+  bool write_end_of_stream_;
 
   scoped_refptr<IOBufferWithByteBuffer> read_buffer_;
   scoped_refptr<IOBufferWithByteBuffer> write_buffer_;
+  IOByteBufferList write_buffer_list_;
   scoped_ptr<net::BidirectionalStream> bidi_stream_;
 
   DISALLOW_COPY_AND_ASSIGN(CronetBidirectionalStreamAdapter);