Game Driver Metrics: plumb gpu app stats into statsd

This change adds all the necessary binder calls to IGpuService.

Bug: 123529932
Test: adb shell cmd stats pull-source 10055
Change-Id: I1113ff44977613527aca8207eeef0ad627eb70ef
diff --git a/services/gpuservice/gpustats/GpuStats.h b/services/gpuservice/gpustats/GpuStats.h
index 9cdcd95..3e56040 100644
--- a/services/gpuservice/gpustats/GpuStats.h
+++ b/services/gpuservice/gpustats/GpuStats.h
@@ -41,6 +41,8 @@
     void dump(const Vector<String16>& args, std::string* result);
     // Pull gpu global stats
     void pullGlobalStats(std::vector<GpuStatsGlobalInfo>* outStats);
+    // Pull gpu app stats
+    void pullAppStats(std::vector<GpuStatsAppInfo>* outStats);
 
 private:
     // Dump global stats