Move gin and v8 portion of profiling to child from common

chrome/child/child_profiling.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/child/child_profiling.h"
+
+#include "base/debug/profiler.h"
+#include "base/logging.h"
+#include "gin/public/debug.h"
+#include "v8/include/v8.h"
+
+namespace {
+
+base::debug::AddDynamicSymbol add_dynamic_symbol_func = NULL;
+base::debug::MoveDynamicSymbol move_dynamic_symbol_func = NULL;
+
+void JitCodeEventHandler(const v8::JitCodeEvent* event) {
+  DCHECK_NE(static_cast<base::debug::AddDynamicSymbol>(NULL),
+            add_dynamic_symbol_func);
+  DCHECK_NE(static_cast<base::debug::MoveDynamicSymbol>(NULL),
+            move_dynamic_symbol_func);
+
+  switch (event->type) {
+    case v8::JitCodeEvent::CODE_ADDED:
+      add_dynamic_symbol_func(event->code_start, event->code_len,
+                              event->name.str, event->name.len);
+      break;
+
+    case v8::JitCodeEvent::CODE_MOVED:
+      move_dynamic_symbol_func(event->code_start, event->new_code_start);
+      break;
+
+    default:
+      break;
+  }
+}
+
+}  // namespace
+
+// static
+void ChildProfiling::ProcessStarted() {
+  // Establish the V8 profiling hooks if we're an instrumented binary.
+  if (base::debug::IsBinaryInstrumented()) {
+    base::debug::ReturnAddressLocationResolver resolve_func =
+        base::debug::GetProfilerReturnAddrResolutionFunc();
+
+    if (resolve_func != NULL) {
+      v8::V8::SetReturnAddressLocationResolver(resolve_func);
+    }
+
+    // Set up the JIT code entry handler and the symbol callbacks if the
+    // profiler supplies them.
+    // TODO(siggi): Maybe add a switch or an environment variable to turn off
+    //     V8 profiling?
+    base::debug::DynamicFunctionEntryHook entry_hook_func =
+        base::debug::GetProfilerDynamicFunctionEntryHookFunc();
+    add_dynamic_symbol_func = base::debug::GetProfilerAddDynamicSymbolFunc();
+    move_dynamic_symbol_func = base::debug::GetProfilerMoveDynamicSymbolFunc();
+
+    if (entry_hook_func != NULL &&
+        add_dynamic_symbol_func != NULL &&
+        move_dynamic_symbol_func != NULL) {
+      gin::Debug::SetFunctionEntryHook(entry_hook_func);
+      gin::Debug::SetJitCodeEventHandler(&JitCodeEventHandler);
+    }
+  }
+}