Support piping log data over the service protocol

runtime/vm/json_stream.h

Index: runtime/vm/json_stream.h
diff --git a/runtime/vm/json_stream.h b/runtime/vm/json_stream.h
index 4ada4e78714454238d3636311bebd198da3decd4..d314dbf62eae1cafa5bb861be4d802132fafca61 100644
--- a/runtime/vm/json_stream.h
+++ b/runtime/vm/json_stream.h
@@ -117,6 +117,7 @@ class JSONStream : ValueObject {
   void PrintValueBool(bool b);
   void PrintValue(intptr_t i);
   void PrintValue64(int64_t i);
+  void PrintValueTimeMillis(int64_t millis);
   void PrintValue(double d);
   void PrintValueBase64(const uint8_t* bytes, intptr_t length);
   void PrintValue(const char* s);
@@ -136,6 +137,7 @@ class JSONStream : ValueObject {
   void PrintPropertyBool(const char* name, bool b);
   void PrintProperty(const char* name, intptr_t i);
   void PrintProperty64(const char* name, int64_t i);
+  void PrintPropertyTimeMillis(const char* name, int64_t millis);
   void PrintProperty(const char* name, double d);
   void PrintPropertyBase64(const char* name,
                            const uint8_t* bytes,
@@ -214,6 +216,9 @@ class JSONObject : public ValueObject {
   void AddProperty64(const char* name, int64_t i) const {
     stream_->PrintProperty64(name, i);
   }
+  void AddPropertyTimeMillis(const char* name, int64_t millis) const {
+    stream_->PrintPropertyTimeMillis(name, millis);
+  }
   void AddProperty(const char* name, double d) const {
     stream_->PrintProperty(name, d);
   }
@@ -285,6 +290,9 @@ class JSONArray : public ValueObject {
   void AddValue(bool b) const { stream_->PrintValueBool(b); }
   void AddValue(intptr_t i) const { stream_->PrintValue(i); }
   void AddValue64(int64_t i) const { stream_->PrintValue64(i); }
+  void AddValueTimeMillis(int64_t millis) const {
+    stream_->PrintValueTimeMillis(millis);
+  }
   void AddValue(double d) const { stream_->PrintValue(d); }
   void AddValue(const char* s) const { stream_->PrintValue(s); }
   void AddValue(const Object& obj, bool ref = true) const {