Chrome: Enable ChromeOS-Wide-Profiling

We want to gather perf data collected by running "perf record -a" from opt-in
ChromeOS users. This CL enables that.

We use debugd in ChromeOS to run quipper, a program that runs "perf record -a"
and returns that data in a protobuf. We do this every 12 hours for 2 seconds.
The overhead is minimal (5% slowdown for 2 seconds on "lumpy" machines).

BUG=157508
TEST=Manual:
Change the perf record interval from 12 hours to 1 minute and set a
breakpoint on ParseProtoIfValid(). It gets hit and the protobuf is parsed
properly.


Review URL: https://chromiumcodereview.appspot.com/11185038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180484 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 13 insertions, 0 deletions

diff --git a/chromeos/dbus/debug_daemon_client.h b/chromeos/dbus/debug_daemon_client.h
index 073189c..1ed0215 100644
--- a/chromeos/dbus/debug_daemon_client.h
+++ b/chromeos/dbus/debug_daemon_client.h
@@ -17,6 +17,10 @@ namespace dbus {
 class Bus;
 }  // namespace dbus
 
+namespace metrics {
+class PerfDataProto;
+}
+
 namespace chromeos {
 
 // DebugDaemonClient is used to communicate with the debug daemon.
@@ -75,6 +79,15 @@ class CHROMEOS_EXPORT DebugDaemonClient {
   virtual void GetNetworkInterfaces(
       const GetNetworkInterfacesCallback& callback) = 0;
 
+  // Called once GetPerfData() is complete only if the the data is successfully
+  // obtained from debugd.
+  typedef base::Callback<void(const std::vector<uint8>& data)>
+      GetPerfDataCallback;
+
+  // Runs perf for |duration| seconds and returns data collected.
+  virtual void GetPerfData(uint32_t duration,
+                           const GetPerfDataCallback& callback) = 0;
+
   // Callback type for GetAllLogs() or GetUserLogFiles().
   typedef base::Callback<void(bool succeeded,
                               const std::map<std::string, std::string>& logs)>