GCE setup: Replace default Clang with 3.6

compute_engine_scripts/buildbots/vm_setup_utils.sh

 #!/bin/bash
 #
 # Utility functions for the Skia GCE setup scripts.
 #
 # Copyright 2014 Google Inc. All Rights Reserved.
 # Author: rmistry@google.com (Ravi Mistry)
 
 
 function install_packages {
   # Add new packages that are not yet part of the image below.
   echo
   echo "Install Required packages"
   $GCOMPUTE_CMD ssh --ssh_user=$PROJECT_USER $INSTANCE_NAME \
     "sudo debconf-set-selections <<< 'mysql-server mysql-server/root_password password tmp_pass' && " \
     "sudo debconf-set-selections <<< 'mysql-server mysql-server/root_password_again password tmp_pass' && " \
     "sudo apt-get -y install mercurial mysql-client mysql-server valgrind libosmesa-dev npm " \
-    "  nodejs-legacy libexpat1-dev:i386 && " \
+    "  nodejs-legacy libexpat1-dev:i386 clang-3.6 && " \
     "mysql -uroot -ptmp_pass -e \"SET PASSWORD = PASSWORD('');\" && " \
     "wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb && " \
     "mkdir -p ~/.config/google-chrome && touch ~/.config/google-chrome/First\ Run && " \
     "(sudo dpkg -i google-chrome-stable_current_amd64.deb || sudo apt-get -f -y install) && " \
     "rm google-chrome-stable_current_amd64.deb " \
     || FAILED="$FAILED InstallPackages"
   echo
 }
 
 function setup_symlinks {
   # Add new symlinks that are not yet part of the image below.
   echo
   echo "Setup Symlinks"
-  # $GCOMPUTE_CMD ssh --ssh_user=$PROJECT_USER $INSTANCE_NAME \
-  #   "sudo ln -s -f /usr/bin/ccache /usr/local/bin/cc" \
-  #   || FAILED="$FAILED InstallPackages"
+   $GCOMPUTE_CMD ssh --ssh_user=$PROJECT_USER $INSTANCE_NAME \
+     "sudo ln -s -f /usr/bin/clang-3.6 /usr/bin/clang && " \
+     "sudo ln -s -f /usr/bin/clang++-3.6 /usr/bin/clang++" \
+     || FAILED="$FAILED InstallPackages"
   echo
 }
 
 function install_go {
   GO_VERSION="go1.4.2.linux-amd64"
   echo
   echo "Install Go"
   $GCOMPUTE_CMD ssh --ssh_user=$PROJECT_USER $INSTANCE_NAME \
       "wget https://storage.googleapis.com/golang/$GO_VERSION.tar.gz && " \
       "tar -zxvf $GO_VERSION.tar.gz && " \
@@ skipping 85 matching lines @@
 }
 
 function reboot {
   echo
   echo "===== Rebooting the instance ======"
   $GCOMPUTE_CMD ssh --ssh_user=$PROJECT_USER $INSTANCE_NAME \
     "sudo reboot" \
     || FAILED="$FAILED Reboot"
   echo
 }