Commits on Jun 4, 2020

1. Avoid creating a vector when constructing Dart typed data objects for… …

   … platform messages
   
   PlatformMessageResponseDart creates an external typed data object to
   hold the contents of large platform messages such as loaded assets.
   The implementation was using a std::vector to hold the message data
   extracted from an fml::Mapping.  The vector is initialized during
   construction, which is unnecessary given that the data will be
   immediately overwritten.
   
   This change centralizes creation of these typed data objects into
   Tonic's DartByteData::Create.  DartByteData::Create will allocate an
   external typed data based on a malloc buffer if the size exceeds a
   threshold.
   
   Fixes flutter/flutter#58572

   

   jason-simmons committed Jun 4, 2020
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