Allow Observatory to run as a hosted web service

runtime/bin/vmservice/client/README_android

Index: runtime/bin/vmservice/client/README_android
diff --git a/runtime/bin/vmservice/client/README_android b/runtime/bin/vmservice/client/README_android
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+Running Observatory against content_shell:
+
+0) Open your mobile web application in Dart Editor and launch it on mobile.
+
+1) Forward localhost:9222 to the content_shell's remote debugging protocol:
+
+$ adb forward tcp:9222 localabstract:content_shell_devtools_remote
+
+2) Start the Observatory servers:
+
+$ ./run.sh
+
+By default Observatory will be available on localhost:9090
+
+3) Release the content_shell's remote debugging protocol by clicking the 'Stop'
+button in the Dart Editor's debugger. By releasing the debugging protocol,
+Observatory can communicate with the content_shell.
+
+4) On Observatory's connect to VM page you should see the name of your app 
+on the right hand side of the page.