Revert 237280 "Remove TraceController"

trunk/src/chrome/common/automation_messages_internal.h

Index: trunk/src/chrome/common/automation_messages_internal.h
===================================================================
--- trunk/src/chrome/common/automation_messages_internal.h	(revision 237451)
+++ trunk/src/chrome/common/automation_messages_internal.h	(working copy)
@@ -934,9 +934,17 @@
 // End tracing (called after BeginTracing). This blocks until tracing has
 // stopped on all processes and all the events are ready to be retrieved.
 IPC_SYNC_MESSAGE_CONTROL0_2(AutomationMsg_EndTracing,
-                            base::FilePath /* result_file_path */,
+                            size_t /* num_trace_chunks */,
                             bool /* success */)
 
+// Retrieve trace event data (called after EndTracing). Must call exactly
+// |num_trace_chunks| times.
+// TODO(jbates): See bug 100255, IPC send fails if message is too big. This
+// code can be removed if that limitation is fixed.
+IPC_SYNC_MESSAGE_CONTROL0_2(AutomationMsg_GetTracingOutput,
+                            std::string /* trace_chunk */,
+                            bool /* success */)
+
 // Used on Mac OS X to read the number of active Mach ports used in the browser
 // process.
 IPC_SYNC_MESSAGE_CONTROL0_1(AutomationMsg_GetMachPortCount,