Canonicalize CHROME_SRC variable on Android

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 73 matching lines @@
 # 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
 # Must have tools like arm-linux-androideabi-gcc on the path for ninja
 export PATH=$PATH:${ANDROID_TOOLCHAIN}
 
+CURRENT_DIR="$(readlink -f ${PWD})"
 if [ -z "${CHROME_SRC}" ]; then
   # If $CHROME_SRC was not set, assume current directory is CHROME_SRC.
-  export CHROME_SRC="${PWD}"
+  export CHROME_SRC="${CURRENT_DIR}"
 fi
 
-if [ "${PWD/"${CHROME_SRC}"/}" == "${PWD}" ]; then
+if [ "${CURRENT_DIR/"${CHROME_SRC}"/}" == "${CURRENT_DIR}" ]; then
   # If current directory is not in $CHROME_SRC, it might be set for other
   # source tree. If $CHROME_SRC was set correctly and we are in the correct
-  # directory, "${PWD/"${CHROME_SRC}"/}" will be "".
-  # Otherwise, it will equal to "${PWD}"
+  # directory, "${CURRENT_DIR/"${CHROME_SRC}"/}" will be "".
+  # Otherwise, it will equal to "${CURRENT_DIR}"
   echo "Warning: Current directory is out of CHROME_SRC, it may not be \
 the one you want."
   echo "${CHROME_SRC}"
 fi
 
 if [ ! -d "${CHROME_SRC}" ]; then
   echo "CHROME_SRC must be set to the path of Chrome source code." >& 2
   return 1
 fi
 
@@ skipping 43 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"