init: grab-bootchart.sh: run bootchart and display results

- KISS as all options are now passed to adb for better or worse
- runs bootchart and immediately displays the results

Bug: 19485335
Bug: 18390773
Change-Id: Id32930031371d0368e605810f0c998232a1d4f16
diff --git a/init/readme.txt b/init/readme.txt
index 32eb4ab..9c24220 100644
--- a/init/readme.txt
+++ b/init/readme.txt
@@ -313,9 +313,8 @@
 bootchart command-line utility:
 
   sudo apt-get install pybootchartgui
+  ANDROID_SERIAL=<device serial number>
   $ANDROID_BUILD_TOP/system/core/init/grab-bootchart.sh
-  bootchart ./bootchart.tgz
-  gnome-open bootchart.png
 
 
 Debugging init