simpleperf: add option for generating java code for report_sample.proto.

Bug: 28114205
Change-Id: Iaa13b47b32c148c4770b4215e1dc2369538592f7
diff --git a/simpleperf/report_sample.proto b/simpleperf/report_sample.proto
index 47e3353..fb7c0b3 100644
--- a/simpleperf/report_sample.proto
+++ b/simpleperf/report_sample.proto
@@ -11,6 +11,8 @@
 syntax = "proto2";
 option optimize_for = LITE_RUNTIME;
 package simpleperf_report_proto;
+option java_package = "com.android.tools.profiler.proto";
+option java_outer_classname = "SimpleperfReport";
 
 message Sample {
   optional uint64 time = 1;