Per kmixter's suggestion, install metrics headers under /usr/include/metrics.
Also, move file installation to the metrics ebuild.
Review URL: http://codereview.chromium.org/2087002
diff --git a/metrics/README b/metrics/README
index 6d011db..2c7072d 100644
--- a/metrics/README
+++ b/metrics/README
@@ -28,7 +28,7 @@
preferred.
- To access the metrics library API in the module, include the
- <metrics_library.h> header file. The file is installed in
+ <metrics/metrics_library.h> header file. The file is installed in
$SYSROOT/usr/include/ when the metrics library is built and
installed.