Add instructions for how to push a Mojo http handler to Google Compute.

R=ben@chromium.org

Review URL: https://codereview.chromium.org/727023002

services/http_server/README.md

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+How to run HTTP apps on GCE
+====
+
+These are the steps to create a Mojo app that handles some URLs and push it to run on Google Compute Engine.
+
+
+## Set up Google Cloud Platform
+Install Google Cloud Platform SDK: https://cloud.google.com/sdk/
+
+
+## Authenticate
+You'll need to set a project for the Google Cloud Platform scripts. If you're a Googler, note that you shouldn't use a corporate card for this.
+
+If you're on the Mojo team, ping jam to get added to the "mojodemos" project first.
+
+If you're not on Mojo team, then create a project on Google Compute Engine and replace "mojodemos" with your project-id below.  Also make sure to enable the "Google Compute Engine" API" at your project's console https://console.developers.google.com
+
+
+```
+gcloud auth login
+gcloud config set project mojodemos
+```
+
+
+## Create a VM
+Now create a VM that'll run the binary. The Debian image doesn't work because of some GLib dependencies in our binaries that we should remove (http://crbug.com/433886). Until then, you have to use the Ubuntu image:
+```
+gcloud compute instances create YOUR-VM-NAME-HERE --image ubuntu-1404-trusty-v20141031a  --image-project ubuntu-os-cloud --zone us-central1-a
+```
+
+Make note of the external IP address of this machine; you'll use this later to connect to the Mojo app.
+
+Install some required packages:
+```
+gcloud compute ssh YOUR-VM-NAME-HERE --command "sudo apt-get install libgconf-2-4 -y" --zone us-central1-a
+gcloud compute ssh YOUR-VM-NAME-HERE --command "sudo apt-get install libnss3 -y" --zone us-central1-a
+```
+
+If you're not using mojodemos project-id and created a new project, add a firewall rule to allow port 80:
+```
+gcloud compute firewall-rules create allow-http  --description "Incoming http allowed." --allow tcp:80
+```
+
+
+## Push the Mojo binaries
+Create a directory to hold the binaries:
+```
+gcloud compute ssh YOUR-VM-NAME-HERE --command "mkdir ~/mojo" --zone us-central1-a
+```
+
+For this example, we'll use the examples/http_handler binary which is a minimal Mojo HTTP app. Assuming you've built the release binary:
+
+```
+gcloud compute copy-files out/Release/libhttp_handler.so out/Release/libhttp_server.so out/Release/libnetwork_service.so out/Release/mojo_shell YOUR-VM-NAME-HERE:~/mojo --zone us-central1-a
+```
+
+
+## Run the Mojo app
+```
+gcloud compute ssh YOUR-VM-NAME-HERE --command "sudo mojo/mojo_shell mojo://http_handler" --zone us-central1-a
+```
+
+Now you can visit the IP address from the previous step.
+
+
+## Delete the VM
+Once you're not using the VM anymore:
+```
+gcloud compute instances delete YOUR-VM-NAME-HERE --zone us-central1-a
+```