Revert "Add fake typed TRACE_EVENT macros for IOS and NACL builds."

This reverts commit 60dfcf2f.

Reason for revert:

FAILED: 
../../third_party/perfetto/src/protozero/message_unittest.cc:298:40: error: expected '(' for function-style cast or type construction
        MessageHandle<FakeRootMessage> handle(msg);
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
../../third_party/perfetto/src/base/test/utils.h:34:30: note: expanded from macro 'EXPECT_DCHECK_DEATH'
    GTEST_EXECUTE_STATEMENT_(statement, "PERFETTO_CHECK")
                             ^~~~~~~~~
1 error generated.

https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8891267197314487504/+/steps/compile/0/stdout

Original change's description:
> Add fake typed TRACE_EVENT macros for IOS and NACL builds.
> 
> This allows users to not care if tracing is supported on their system.
> 
> Bug: 916074
> Change-Id: I69aa8178bb19f1a65186a2aba4f08699b6ba6ee3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1953210
> Reviewed-by: Stephen Nusko <nuskos@chromium.org>
> Reviewed-by: Eric Seckler <eseckler@chromium.org>
> Commit-Queue: Stephen Nusko <nuskos@chromium.org>
> Auto-Submit: Stephen Nusko <nuskos@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#731514}

TBR=eseckler@chromium.org,nuskos@chromium.org

Change-Id: Ia0cc5d2a330a408898c6248378726e43ddd8a732
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 916074
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2000964Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731531}

services/tracing/public/cpp/BUILD.gn

@@ -17,42 +17,14 @@ source_set("traced_process") {
 
   public_deps = [ "//services/tracing/public/mojom" ]
 
-  deps = [ ":cpp" ]
+  if (!is_nacl && !is_ios) {
+    deps = [ ":cpp" ]
+  }
 }
 
-# On IOS and NACL we don't support tracing so we only include the minimum needed
-# to support a fake typed TRACE_EVENT macro. However this means we don't have
-# any .cc files and thus on iOS and NaCl it needs to be a source_set and not a
-# component. |tracing_lib_type| decides which version to build.
 if (!is_nacl && !is_ios) {
-  tracing_lib_type = "component"
-} else {
-  tracing_lib_type = "source_set"
-}
-
-target(tracing_lib_type, "cpp") {
-  sources = [
-    "perfetto/event_context.h",
-    "perfetto/macros.h",
-    "perfetto/macros_internal.h",
-  ]
-
-  defines = [ "IS_TRACING_CPP_IMPL" ]
-  output_name = "tracing_cpp"
-
-  configs += [ "//build/config/compiler:wexit_time_destructors" ]
-
-  public_deps = [
-    "//base",
-    "//third_party/perfetto:libperfetto",
-  ]
-
-  deps = [ "//third_party/perfetto/include/perfetto/protozero" ]
-
-  all_dependent_configs = [ "//third_party/perfetto/gn:public_config" ]
-
-  if (!is_nacl && !is_ios) {
-    sources += [
+  component("cpp") {
+    sources = [
       "base_agent.cc",
       "base_agent.h",
       "perfetto/dummy_producer.cc",
@@ -68,7 +40,9 @@ target(tracing_lib_type, "cpp") {
       "perfetto/java_heap_profiler/hprof_parser_android.h",
       "perfetto/java_heap_profiler/java_heap_profiler_android.cc",
       "perfetto/java_heap_profiler/java_heap_profiler_android.h",
+      "perfetto/macros.h",
       "perfetto/macros_internal.cc",
+      "perfetto/macros_internal.h",
       "perfetto/perfetto_config.cc",
       "perfetto/perfetto_config.h",
       "perfetto/perfetto_producer.cc",
@@ -105,14 +79,24 @@ target(tracing_lib_type, "cpp") {
       "tracing_features.h",
     ]
 
-    public_deps += [
+    defines = [ "IS_TRACING_CPP_IMPL" ]
+    output_name = "tracing_cpp"
+
+    configs += [ "//build/config/compiler:wexit_time_destructors" ]
+
+    public_deps = [
+      "//base",
       "//components/tracing:startup_tracing",
       "//mojo/public/cpp/bindings",
       "//services/tracing/public/mojom",
+      "//third_party/perfetto:libperfetto",
     ]
 
-    deps += [
+    all_dependent_configs = [ "//third_party/perfetto/gn:public_config" ]
+
+    deps = [
       "//build:chromecast_buildflags",
+      "//third_party/perfetto/include/perfetto/protozero",
       "//third_party/perfetto/protos/perfetto/trace/chrome:minimal_complete_lite",
     ]
 
@@ -138,5 +122,5 @@ target(tracing_lib_type, "cpp") {
       # stack_unwinder_android.cc overrides the dl_unwind_find_exidx function.
       all_dependent_configs += [ ":wrap_find_exidx" ]
     }
-  }  # !is_ios && !is_nacl
-}
+  }
+}  # !is_nacl && !is_ios

services/tracing/public/cpp/perfetto/macros.h

@@ -8,11 +8,6 @@
 #include "base/trace_event/trace_event.h"
 #include "services/tracing/public/cpp/perfetto/macros_internal.h"
 
-// Needed not for this file but for every user of the TRACE_EVENT macros for the
-// lambda definition. So included here for convenience.
-#include "services/tracing/public/cpp/perfetto/event_context.h"
-#include "third_party/perfetto/protos/perfetto/trace/track_event/track_event.pbzero.h"
-
 #if defined(TRACE_EVENT_BEGIN)
 #error "Another copy of perfetto tracing macros have been included"
 #endif

services/tracing/public/cpp/perfetto/macros_internal.h

@@ -5,18 +5,14 @@
 #ifndef SERVICES_TRACING_PUBLIC_CPP_PERFETTO_MACROS_INTERNAL_H_
 #define SERVICES_TRACING_PUBLIC_CPP_PERFETTO_MACROS_INTERNAL_H_
 
-#include "build/build_config.h"
-
-namespace perfetto {
-class EventContext;
-}
-
-#if !defined(OS_IOS) && !defined(OS_NACL)
-
 #include "base/component_export.h"
 #include "base/trace_event/trace_event.h"
 #include "services/tracing/public/cpp/perfetto/trace_event_data_source.h"
 
+namespace perfetto {
+class TrackEventContext;
+}
+
 namespace tracing {
 namespace internal {
 base::Optional<base::trace_event::TraceEvent> COMPONENT_EXPORT(TRACING_CPP)
@@ -28,7 +24,7 @@ base::Optional<base::trace_event::TraceEvent> COMPONENT_EXPORT(TRACING_CPP)
 // A simple function that will add the TraceEvent requested and will call the
 // |argument_func| after the track_event has been filled in.
 template <
-    typename TrackEventArgumentFunction = void (*)(perfetto::EventContext)>
+    typename TrackEventArgumentFunction = void (*)(perfetto::TrackEventContext)>
 static inline base::trace_event::TraceEventHandle AddTraceEvent(
     char phase,
     const unsigned char* category_group_enabled,
@@ -91,33 +87,4 @@ static inline base::trace_event::TraceEventHandle AddTraceEvent(
     return 0;                                                                 \
   }()};
 
-#else  // !defined(OS_IOS) && !defined(OS_NACL)
-
-// Tracing isn't supported on IOS or NACL so we just black hole all the
-// parameters into a function that doesn't do anything. This ensures that no
-// warnings about unused parameters are generated.
-
-namespace tracing {
-namespace internal {
-template <
-    typename TrackEventArgumentFunction = void (*)(perfetto::EventContext)>
-static inline base::trace_event::TraceEventHandle AddTraceEvent(
-    char,
-    const unsigned char*,
-    const char*,
-    unsigned int,
-    TrackEventArgumentFunction) {
-  return {0, 0, 0};
-}
-}  // namespace internal
-}  // namespace tracing
-
-#define TRACING_INTERNAL_ADD_TRACE_EVENT(phase, category, name, flags, ...) \
-  tracing::internal::AddTraceEvent(phase, nullptr, name, flags, ##__VA_ARGS__);
-
-#define TRACING_INTERNAL_SCOPED_ADD_TRACE_EVENT(category, name, ...)           \
-  TRACING_INTERNAL_ADD_TRACE_EVENT('B', category, name, TRACE_EVENT_FLAG_NONE, \
-                                   ##__VA_ARGS__);
-#endif  // else of !defined(OS_IOS) && !defined(OS_NACL)
-
 #endif  // SERVICES_TRACING_PUBLIC_CPP_PERFETTO_MACROS_INTERNAL_H_