Use Session#request_tc to replace manual 'tc <<' calls

We should pass tc (ThreadClient)'s data in the Session in a uniformed way:
either all with ivar or all with local variable. And since the local variable
approach has been rejects (#293), we may want to go with @ivar.

This change for unification is needed for later changes.

Author: st0012

lib/debug/server_cdp.rb

@@ -572,13 +572,13 @@ def fail_response req, **result
     def process_protocol_request req
       case req['method']
       when 'Debugger.stepOver', 'Debugger.stepInto', 'Debugger.stepOut', 'Debugger.resume', 'Debugger.enable'
-        @tc << [:cdp, :backtrace, req]
+        request_tc [:cdp, :backtrace, req]
       when 'Debugger.evaluateOnCallFrame'
         frame_id = req.dig('params', 'callFrameId')
         group = req.dig('params', 'objectGroup')
         if fid = @frame_map[frame_id]
           expr = req.dig('params', 'expression')
-          @tc << [:cdp, :evaluate, req, fid, expr, group]
+          request_tc [:cdp, :evaluate, req, fid, expr, group]
         else
           fail_response req,
                         code: INVALID_PARAMS,
@@ -591,9 +591,9 @@ def process_protocol_request req
           when 'local'
             frame_id = ref[1]
             fid = @frame_map[frame_id]
-            @tc << [:cdp, :scope, req, fid]
+            request_tc [:cdp, :scope, req, fid]
           when 'properties'
-            @tc << [:cdp, :properties, req, oid]
+            request_tc [:cdp, :properties, req, oid]
           when 'script', 'global'
             # TODO: Support script and global types
             @ui.respond req, result: []

lib/debug/server_dap.rb

@@ -435,15 +435,15 @@ def process_protocol_request req
       case req['command']
       when 'stepBack'
         if @tc.recorder&.can_step_back?
-          @tc << [:step, :back]
+          request_tc [:step, :back]
         else
           fail_response req, message: 'cancelled'
         end
 
       when 'stackTrace'
         tid = req.dig('arguments', 'threadId')
         if tc = find_waiting_tc(tid)
-          tc << [:dap, :backtrace, req]
+          request_tc [:dap, :backtrace, req]
         else
           fail_response req
         end
@@ -452,7 +452,7 @@ def process_protocol_request req
         if @frame_map[frame_id]
           tid, fid = @frame_map[frame_id]
           if tc = find_waiting_tc(tid)
-            tc << [:dap, :scopes, req, fid]
+            request_tc [:dap, :scopes, req, fid]
           else
             fail_response req
           end
@@ -484,7 +484,7 @@ def process_protocol_request req
             tid, fid = @frame_map[frame_id]
 
             if tc = find_waiting_tc(tid)
-              tc << [:dap, :scope, req, fid]
+              request_tc [:dap, :scope, req, fid]
             else
               fail_response req
             end
@@ -493,7 +493,7 @@ def process_protocol_request req
             tid, vid = ref[1], ref[2]
 
             if tc = find_waiting_tc(tid)
-              tc << [:dap, :variable, req, vid]
+              request_tc [:dap, :variable, req, vid]
             else
               fail_response req
             end
@@ -511,7 +511,7 @@ def process_protocol_request req
           tid, fid = @frame_map[frame_id]
           expr = req.dig('arguments', 'expression')
           if tc = find_waiting_tc(tid)
-            tc << [:dap, :evaluate, req, fid, expr, context]
+            request_tc [:dap, :evaluate, req, fid, expr, context]
           else
             fail_response req
           end
@@ -537,7 +537,7 @@ def process_protocol_request req
           if col  = req.dig('arguments', 'column')
             text = text.split(/\n/)[line.to_i - 1][0...(col.to_i - 1)]
           end
-          tc << [:dap, :completions, req, fid, text]
+          request_tc [:dap, :completions, req, fid, text]
         else
           fail_response req
         end