Add the url optional argument to adb_gdb --start.

build/android/adb_gdb

 #!/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.
 #
 
 # A generic script used to attach to a running Chromium process and
 # debug it. Most users should not use this directly, but one of the
 # wrapper scripts like adb_gdb_content_shell
@@ skipping 84 matching lines @@
 PID=
 PORT=
 PRIVILEGED=
 PRIVILEGED_INDEX=
 PROGRAM_NAME="activity"
 PULL_LIBS=
 PULL_LIBS_DIR=
 SANDBOXED=
 SANDBOXED_INDEX=
 START=
+START_URL=
 ATTACH_DELAY=1
 SU_PREFIX=
 SYMBOL_DIR=
 TARGET_ARCH=
 TOOLCHAIN=
 VERBOSE=0
 
 for opt; do
   optarg=$(expr "x$opt" : 'x[^=]*=\(.*\)')
   case $opt in
@@ skipping 52 matching lines @@
     --sandboxed)
       SANDBOXED=true
       ;;
     --sandboxed=*)
       SANDBOXED=true
       SANDBOXED_INDEX=$optarg
       ;;
     --script=*)
       GDBINIT=$optarg
       ;;
+    --start=*)
+      START_URL=$optarg
+      ;& # fallthrough
     --start)
       START=true
       ;;
     --attach-delay=*)
       ATTACH_DELAY=$optarg
       ;;
     --su-prefix=*)
       SU_PREFIX=$optarg
       ;;
     --symbol-dir=*)
@@ skipping 114 matching lines @@
   --sandboxed           Debug first sandboxed process we find.
   --sandboxed=<num>     Debug specific sandboxed process.
   --symbol-dir=<path>   Specify directory with symbol shared libraries.
   --output-directory=<path> Specify the output directory (e.g. "out/Debug").
   --package-name=<name> Specify package name (alternative to 1st argument).
   --privileged          Debug first privileged process we find.
   --privileged=<num>    Debug specific privileged process.
   --program-name=<name> Specify program name (cosmetic only).
   --pid=<pid>           Specify application process pid.
   --force               Kill any previous debugging session, if any.
-  --start               Start package's activity on device.
+  --start[=<url>]       Start package's activity on device.
   --attach-delay=<num>  Seconds to wait for gdbserver to attach to the
                         remote process before starting gdb. Default 1.
                         <num> may be a float if your sleep(1) supports it.
   --ui                  Use gdbtui instead of gdb
   --activity=<name>     Activity name for --start [$DEFAULT_ACTIVITY].
   --annotate=<num>      Enable gdb annotation.
   --script=<file>       Specify extra GDB init script.
 
   --gdbserver=<file>    Specify target gdbserver binary.
   --gdb=<file>          Specify host gdb client binary.
@@ skipping 353 matching lines @@
 if [ "$FORCE" ]; then
   GDBSERVER_PIDS=$(adb_shell ps | awk '$9 ~ /gdbserver/ { print $2; }')
   for GDB_PID in $GDBSERVER_PIDS; do
     log "Killing previous gdbserver (PID=$GDB_PID)"
     adb_shell kill -9 $GDB_PID
   done
 fi
 
 if [ "$START" ]; then
   log "Starting $PROGRAM_NAME on device."
-  adb_shell am start -n $PACKAGE_NAME/$ACTIVITY 2>/dev/null
+  adb_shell am start -n $PACKAGE_NAME/$ACTIVITY ${START_URL:+-d "$START_URL"}
   adb_shell ps | grep -q $PACKAGE_NAME
   fail_panic "Could not start $PROGRAM_NAME on device. Are you sure the \
 package is installed?"
 fi
 
 # Return the timestamp of a given file, as number of seconds since epoch.
 # $1: file path
 # Out: file timestamp
 get_file_timestamp () {
   stat -c %Y "$1" 2>/dev/null
@@ skipping 322 matching lines @@
 
 if [ "$VERBOSE" -gt 0 ]; then
   echo "### START $COMMANDS"
   cat $COMMANDS
   echo "### END $COMMANDS"
 fi
 
 log "Launching gdb client: $GDB $GDB_ARGS -x $COMMANDS"
 $GDB $GDB_ARGS -x $COMMANDS &&
 rm -f "$GDBSERVER_PIDFILE"