dump value from DrawAnnotation commands

Change-Id: Ic889a8877522d4a51ada2aed7f766bc4569924d8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/344700
Reviewed-by: Kevin Lubick <[email protected]>
Reviewed-by: Nathaniel Nifong <[email protected]>
Commit-Queue: Nathaniel Nifong <[email protected]>

Author: Nathaniel Nifong

tools/debugger/DrawCommand.cpp

@@ -1183,7 +1183,9 @@ void DrawAnnotationCommand::toJSON(SkJSONWriter& writer, UrlDataManager& urlData
     MakeJsonRect(writer, fRect);
     writer.appendString("key", fKey.c_str());
     if (fValue) {
-        // TODO: dump out the "value"
+        writer.appendString("value", std::string(
+            static_cast<const char*>(fValue->data()), fValue->size()
+            ).c_str());
     }
 
     SkString desc;