Add trace event Pepper API

ppapi/shared_impl/ppb_instance_shared.cc

Index: ppapi/shared_impl/ppb_instance_shared.cc
diff --git a/ppapi/shared_impl/ppb_instance_shared.cc b/ppapi/shared_impl/ppb_instance_shared.cc
index dd46bec3a70d849c4741c020eac0051f8cf6b37e..35307536bf258baa18523e0e3e5b7da8f5b95219 100644
--- a/ppapi/shared_impl/ppb_instance_shared.cc
+++ b/ppapi/shared_impl/ppb_instance_shared.cc
@@ -6,6 +6,8 @@
 
 #include <string>
 
+#include "base/debug/trace_event.h"
+#include "base/threading/platform_thread.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_input_event.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
@@ -58,6 +60,45 @@ int32_t PPB_Instance_Shared::ValidateRequestInputEvents(
   return PP_OK;
 }
 
+// PPB_Trace_Events is a shared implementation because Trace Events can be sent
+// from either the plugin process or renderer process depending on whether the
+// plugin is in- or out-of-process.  This will not currently work in NaCl
+// because this code assumes we are in a chrome process space at this point. In
+// order to make it work in NaCl, we will probably need some proxy-side
+// management to make this work quickly without requiring IPCs for every call,

[jbauman, 2012/12/14 00:36:07]

This isn't true anymore.

[elijahtaylor1, 2012/12/18 20:40:31]

Done.

+// and possibly a small re-write to the API.
+void* PPB_Instance_Shared::GetCategoryEnabled(PP_Instance instance,
+                                              const char* category_name) {
+  // This casting is here because all mem_t return types in Pepper are void* and
+  // non-const.  All mem_t parameters are const void* so there is no way to
+  // return a pointer type to the caller without some const_cast.  The pointer
+  // type the tracing system works with is normally unsigned char*.
+  return const_cast<void*>(reinterpret_cast<const void*>(
+      base::debug::TraceLog::GetInstance()->GetCategoryEnabled(category_name)));
+}
+
+int32_t PPB_Instance_Shared::AddTraceEvent(PP_Instance instance,
+                                          int8_t phase,
+                                          const void* category_enabled,
+                                          const char* name,
+                                          uint64_t id,
+                                          uint32_t num_args,
+                                          const char* arg_names[],
+                                          const uint8_t arg_types[],
+                                          const uint64_t arg_values[],
+                                          int32_t threshold_begin_id,
+                                          int64_t threshold,
+                                          uint8_t flags) {
+  return base::debug::TraceLog::GetInstance()->AddTraceEvent(phase,
+      (const unsigned char*)category_enabled, name, id, num_args, arg_names,
+      arg_types, arg_values, threshold_begin_id, threshold, flags);
+}
+
+void PPB_Instance_Shared::SetThreadName(PP_Instance instance,
+                                        const char* thread_name) {
+  base::PlatformThread::SetName(thread_name);
+}
+
 bool PPB_Instance_Shared::ValidateSetCursorParams(PP_MouseCursor_Type type,
                                                   PP_Resource image,
                                                   const PP_Point* hot_spot) {