CMake: control static/shared the normal CMake way.

cmake/cmake_build

 #!/bin/bash
 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script for building with CMake on Skia build bots.
 # If you have CMake installed on your system, you can just use it normally.
 
 set -e
 set -x
 
 here=$(cd `dirname $0`; echo `pwd`)
 cores=32
 
 if [[ -z "$BUILDTYPE" || -z "$SKIA_OUT" ]]; then
     echo "If you're a bot, you should be setting BUILDTYPE ($BUILDTYPE) and SKIA_OUT ($SKIA_OUT)."
     echo "If you're not a bot, you don't want to run this script."
     exit 1
 fi
 
 echo "Bootstrapping CMake"
 pushd $here/../third_party/externals/cmake
 ./bootstrap --parallel=$cores
 make -j $cores cmake
 popd
 
-echo "Building with bootstrapped CMake"
+echo "Building static library with bootstrapped CMake"
 mkdir -p $SKIA_OUT/$BUILDTYPE
 pushd $SKIA_OUT/$BUILDTYPE
-$here/../third_party/externals/cmake/bin/cmake -DCMAKE_BUILD_TYPE=$BUILDTYPE $here -G Ninja
+$here/../third_party/externals/cmake/bin/cmake -DCMAKE_BUILD_TYPE=$BUILDTYPE \
+    $here -G Ninja
 ninja
 popd
+
+echo "Building shared library with bootstrapped CMake"
+mkdir -p $SKIA_OUT/$BUILDTYPE
+pushd $SKIA_OUT/$BUILDTYPE
+$here/../third_party/externals/cmake/bin/cmake -DCMAKE_BUILD_TYPE=$BUILDTYPE -DBUILD_SHARED_LIBS=1 \
+    $here -G Ninja
+ninja
+popd