Abort fetch, gclient, gsutil.py when update_depot_tools fails on Windows

We should fail when we fail to update depot_tools instead of continuing
the execution silently. Otherwise, developers might get stuck on a bad
depot_tools revision without knowing.

Change-Id: I0431a24a28a77aca8c66352939a0252c458b3e9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2208616Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

fetch.bat

@@ -6,6 +6,10 @@ setlocal
 
 :: Synchronize the root directory before deferring control back to gclient.py.
 call "%~dp0\update_depot_tools.bat"
+:: Abort the script if we failed to update depot_tools.
+IF %errorlevel% NEQ 0 (
+  goto :EOF
+)
 
 :: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
 :: standalone, but allow other PATH manipulations to take priority.

gclient.bat

@@ -9,6 +9,10 @@ IF "%DEPOT_TOOLS_UPDATE%" == "0" GOTO :CALL_GCLIENT
 
 :: Synchronize the root directory before deferring control back to gclient.py.
 call "%~dp0update_depot_tools.bat" %*
+:: Abort the script if we failed to update depot_tools.
+IF %errorlevel% NEQ 0 (
+  goto :EOF
+)
 
 :CALL_GCLIENT
 :: Ensure that "depot_tools" is somewhere in PATH so this tool can be used

gsutil.py.bat

@@ -6,6 +6,10 @@ setlocal
 
 :: Synchronize the root directory before deferring control back to gsutil.py.
 call "%~dp0update_depot_tools.bat" %*
+:: Abort the script if we failed to update depot_tools.
+IF %errorlevel% NEQ 0 (
+  goto :EOF
+)
 
 :: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
 :: standalone, but allow other PATH manipulations to take priority.