Add Service ID zones to service protocol

runtime/vm/service/service.idl

 // <h2>Connecting to the VM Service</h2>
 //
 // TODO(turnidge): Describe how to connect, etc.
 //
 // <h2>Types</h2>
 //
 // Every non-error response returned by the VM Service has the
 // <code>type</code> property.  This allows the client distinguish
 // between different kinds of responses.
 //
@@ skipping 109 matching lines @@
   // Requests that an isolate resume execution.
   //
   // <code>step</code> is optional and indicates whether execution
   // should single-step.
   resume(isolateId string, step StepOption) Response
 
   // Evaluate an expression in the context of some target.
   eval(isolateId string, targetId string, expression string) InstanceRef
 
   // Returns the current execution stack for an isolate.
-  getStack(isolateId string) Stack
+  //
+  // _full is an optional private parameter.
+  getStack(isolateId string, _full bool) Stack
 
   // Returns code coverage information for a library, script, class,
   // or function.
   getCoverage(isolateId string, targetId string) CodeCoverage
 
   // Returns call site cache information for a function.
   _getCallSiteData(isolateId string, targetId string) _CallSiteData
 
   // Returns a full cpu profile for an isolate.
   //
@@ skipping 388 matching lines @@
   // The source code for this script.  For certain built-in scripts,
   // this may be reconstructed without source comments.
   source string
 
   // A table encoding a mapping from token position to line and column.
   //
   // Each entry in the array consists of a line number followed by
   // (tokenPos, columnNumber) pairs:
   //
   //    [lineNumber, (tokenPos, columnNumber)*]
-  // 
+  //
   // For example, the following table:
   //
   //    [[1, 100, 5, 101, 8],[2, 102, 7]]
   //
   // Encodes the following mapping:
   //
   //    tokenPos  line   column
   //    --------  ------ ------
   //    100       1      5
   //    101       1      8
@@ skipping 579 matching lines @@
 
 
 struct _EchoResponse extends Response {
   text string
 }
 
 
 struct UNDOCUMENTED {
   TODO int
 }