Android: Fix stack script when run not from src/ directory

Noticed my test stack wasn't symbolizing when I ran the script with
PWD=$SRC/out/Debug

Turns out the stack script calls os.chdir() at some point, so need to
save --output-directory as an absolute path.

Also updated other paths passed as flags to use abspath().

Change-Id: I91fe857fa1af5c94b2783b0f4083f4d4ef927e68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1776611
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692028}

third_party/android_platform/development/scripts/stack.py

@@ -167,9 +167,9 @@ def main(argv):
     if option == "--help":
       PrintUsage()
     elif option == "--symbols-dir":
-      symbol.SYMBOLS_DIR = os.path.expanduser(value)
+      symbol.SYMBOLS_DIR = os.path.abspath(os.path.expanduser(value))
     elif option == "--symbols-zip":
-      zip_arg = os.path.expanduser(value)
+      zip_arg = os.path.abspath(os.path.expanduser(value))
     elif option == "--arch":
       symbol.ARCH = value
       arch_defined = True
@@ -177,9 +177,9 @@ def main(argv):
       symbol.CHROME_SYMBOLS_DIR = os.path.join(constants.DIR_SOURCE_ROOT,
                                                value)
     elif option == "--output-directory":
-      constants.SetOutputDirectory(value)
+      constants.SetOutputDirectory(os.path.abspath(value))
     elif option == "--packed-lib":
-      packed_libs.append(os.path.expanduser(value))
+      packed_libs.append(os.path.abspath(os.path.expanduser(value)))
     elif option == "--more-info":
       more_info = True
     elif option == "--less-info":