Add ${ANDROID_TOOLCHAIN} to $PATH to assist ninja.

build/android/envsetup.sh

 #!/bin/bash
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Sets up environment for building Chromium on Android. Only Android NDK,
 # Revision 6b on Linux or Mac is offically supported.
 #
 # To run this script, the system environment ANDROID_NDK_ROOT must be set
@@ skipping 55 matching lines @@
 # define a special variable for bringup purposes.
 case "${ANDROID_BUILD_TOP-undefined}" in
   "undefined")
     DEFINES+=" android_upstream_bringup=1"
     ;;
 esac
 
 toolchain_path="${ANDROID_NDK_ROOT}/toolchains/${toolchain_arch}/prebuilt/"
 export ANDROID_TOOLCHAIN="${toolchain_path}/${toolchain_dir}/bin/"
 
+if [ ! -d "${ANDROID_TOOLCHAIN}" ]; then
+  echo "Can not find Android toolchain in ${ANDROID_TOOLCHAIN}." >& 2
+  echo "The NDK version might be wrong." >& 2
+  return 1
+fi
+
 export ANDROID_SDK_VERSION="15"
 
 # Needed by android antfiles when creating apks.
 export ANDROID_SDK_HOME=${ANDROID_SDK_ROOT}
 
 # Add Android SDK/NDK tools to system path.
 export PATH=$PATH:${ANDROID_NDK_ROOT}
 export PATH=$PATH:${ANDROID_SDK_ROOT}/tools
 export PATH=$PATH:${ANDROID_SDK_ROOT}/platform-tools
-
-if [ ! -d "${ANDROID_TOOLCHAIN}" ]; then
-  echo "Can not find Android toolchain in ${ANDROID_TOOLCHAIN}." >& 2
-  echo "The NDK version might be wrong." >& 2
-  return 1
-fi
+# Must have tools like arm-linux-androideabi-gcc on the path for ninja
+export PATH=$PATH:${ANDROID_TOOLCHAIN}
 
 if [ -z "${CHROME_SRC}" ]; then
   # If $CHROME_SRC was not set, assume current directory is CHROME_SRC.
   export CHROME_SRC=$(readlink -f .)
 fi
 
 if [ ! -d "${CHROME_SRC}" ]; then
   echo "CHROME_SRC must be set to the path of Chrome source code." >& 2
   return 1
 fi
@@ skipping 41 matching lines @@
 export GYP_DEFINES="${DEFINES}"
 
 # Use the "android" flavor of the Makefile generator for both Linux and OS X.
 export GYP_GENERATORS="make-android"
 
 # Use our All target as the default
 export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} default_target=All"
 
 # We want to use our version of "all" targets.
 export CHROMIUM_GYP_FILE="${CHROME_SRC}/build/all_android.gyp"