Profiler-instrumentation of the startup time.

chrome/app/chrome_main_delegate.cc

Index: chrome/app/chrome_main_delegate.cc
diff --git a/chrome/app/chrome_main_delegate.cc b/chrome/app/chrome_main_delegate.cc
index e17bf8128a60481133fadce18f5e95458de29590..56284139bef8062f7bb32424bf0fc530a91536d5 100644
--- a/chrome/app/chrome_main_delegate.cc
+++ b/chrome/app/chrome_main_delegate.cc
@@ -15,6 +15,7 @@
 #include "base/path_service.h"
 #include "base/process/memory.h"
 #include "base/process/process_handle.h"
+#include "base/profiler/scoped_tracker.h"

[cpu_(ooo_6.6-7.5), 2015/03/16 22:16:25]

why do we need this here?

[yao, 2015/03/17 14:32:01]

Done.

 #include "base/strings/string_util.h"
 #include "build/build_config.h"
 #include "chrome/browser/chrome_content_browser_client.h"
@@ -971,3 +972,17 @@ ChromeMainDelegate::CreateContentUtilityClient() {
   return g_chrome_content_utility_client.Pointer();
 #endif
 }
+
+bool ChromeMainDelegate::ShouldEnableProfilerRecording() {
+  switch (chrome::VersionInfo::GetChannel()) {
+    case chrome::VersionInfo::CHANNEL_UNKNOWN:
+    case chrome::VersionInfo::CHANNEL_CANARY:
+      return true;
+    case chrome::VersionInfo::CHANNEL_DEV:
+    case chrome::VersionInfo::CHANNEL_BETA:
+    case chrome::VersionInfo::CHANNEL_STABLE:
+    default:
+      // Don't enable instrumentation.
+      return false;
+  }
+}