This cl does the following things:

0) Implements a skeleton of incident_helper
1) Implements FileSection class which calls incident_helper to parse
   file content to protobuf
2) Adds Kernel Wake Sources to incident.proto and makes it parsed by
   FileSection
3) Adds basic gtests to test FdBuffer, io_utils, FileSection
implementation

Bug: 62923266
Bug: 62926061
Test: manual - push incidentd, incident_helper and incident to my device
      and verify kernel wakeup sources file is able to be parsed.
Change-Id: I2aa6b6158d962ce70e6fa6c8a9c42213a45ff41c
diff --git a/Android.bp b/Android.bp
index cb840cf..eb35ffb 100644
--- a/Android.bp
+++ b/Android.bp
@@ -39,6 +39,7 @@
             // runtime, as well as the only protos that are actually
             // needed by the device.
             srcs: [
+                "core/proto/android/os/kernelwake.proto",
                 "core/proto/android/service/graphicsstats.proto",
             ],
             shared: {
@@ -49,6 +50,7 @@
 }
 
 subdirs = [
+    "cmds/*",
     "core/jni",
     "libs/*",
     "media/*",