Use BUILD_TYPE in cmake_build

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"
-mkdir -p $SKIA_OUT
-pushd $SKIA_OUT
+mkdir -p $SKIA_OUT/$BUILDTYPE
+pushd $SKIA_OUT/$BUILDTYPE

[borenet, 2016/04/25 12:30:50]

Note: most bots write to out/$BUILDERNAME/$BUILDTYPE.  Is that necessary here?

[rmistry, 2016/04/25 12:34:25]

When called from the non-swarming bot it was writing to the "wrong" place anyway
so it did not seem to care about the BUILDERNAME.

When called from the swarming bot AFAICT everything writes to out/$BUILDTYPE
(not BUILDERNAME) and is copied out with skia_api.copy_build_products.

 $here/../third_party/externals/cmake/bin/cmake -DCMAKE_BUILD_TYPE=$BUILDTYPE $here -G Ninja
 ninja
 popd