prepare skia for shared library build on android

platform_tools/android/bin/android_setup.sh

 function exportVar {
   NAME=$1
   VALUE=$2
   echo export $NAME=\"$VALUE\"
   export $NAME="$VALUE"
 }
 
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 # A valid Android SDK installation is required to build the sample app.
@@ skipping 108 matching lines @@
 exportVar STRIP "$ANDROID_TOOLCHAIN_PREFIX-strip"
 
 # Helper function to configure the GYP defines to the appropriate values
 # based on the target device.
 setup_device() {
   DEFINES="OS=android"
   DEFINES="${DEFINES} host_os=$(uname -s | sed -e 's/Linux/linux/;s/Darwin/mac/')"
   DEFINES="${DEFINES} skia_os=android"
   DEFINES="${DEFINES} android_base=${SCRIPT_DIR}/.."
   DEFINES="${DEFINES} android_toolchain=${TOOLCHAIN_TYPE}"
+  DEFINES="${DEFINES} skia_shared_lib=1"
 
   # Setup the build variation depending on the target device
   TARGET_DEVICE="$1"
 
   if [ -z "$TARGET_DEVICE" ]; then
     echo "INFO: no target device type was specified so using the default 'arm_v7'"
     TARGET_DEVICE="arm_v7"
   fi
 
   case $TARGET_DEVICE in
@@ skipping 53 matching lines @@
 # Use the "android" flavor of the Makefile generator for both Linux and OS X.
 exportVar GYP_GENERATORS "make-android"
 
 # Helper function so that when we run "make" to build for clank it exports
 # the toolchain variables to make.
 #make_android() {
 #  CC="$CROSS_CC" CXX="$CROSS_CXX" LINK="$CROSS_LINK" \
 #  AR="$CROSS_AR" RANLIB="$CROSS_RANLIB" \
 #    command make $*
 #}