Make gdb debugging on un-rooted devices work for Android 5.x.

Android 5.x does not allow running the gdb executable in
/data/local/tmp. For gdb to be executable by the package
it need to be located in /data/data/{PACKAGE-NAME} which is
allowed to run the exucutable.

BUG=453379

Review URL: https://codereview.chromium.org/884993003

Cr-Commit-Position: refs/heads/master@{#313737}

build/android/adb_gdb

@@ -36,7 +36,7 @@ clean_exit () {
     fi
     if [ "$TARGET_GDBSERVER" ]; then
       log "Removing target gdbserver binary: $TARGET_GDBSERVER."
-      "$ADB" shell rm "$TARGET_GDBSERVER" >/dev/null 2>&1
+      "$ADB" shell run-as "$PACKAGE_NAME" rm "$TARGET_GDBSERVER" >/dev/null 2>&1
     fi
     log "Cleaning up: $TMPDIR"
     rm -rf "$TMPDIR"
@@ -734,7 +734,8 @@ if [ -z "$SYMBOL_DIR" ]; then
 fi
 
 # Allow several concurrent debugging sessions
-TARGET_GDBSERVER=/data/local/tmp/gdbserver-adb-gdb-$TMP_ID
+TARGET_GDBSERVER=/data/data/$PACKAGE_NAME/gdbserver-adb-gdb-$TMP_ID
+TMP_TARGET_GDBSERVER=/data/local/tmp/gdbserver-adb-gdb-$TMP_ID
 
 # Return the build fingerprint contained in a build.prop file.
 # $1: path to build.prop file
@@ -906,7 +907,9 @@ SOLIB_DIRS=$(find $PULL_LIBS_DIR -mindepth 1 -maxdepth 4 -type d | \
 
 # Push gdbserver to the device
 log "Pushing gdbserver $GDBSERVER to $TARGET_GDBSERVER"
-adb push $GDBSERVER $TARGET_GDBSERVER &>/dev/null
+adb push $GDBSERVER $TMP_TARGET_GDBSERVER &>/dev/null
+adb shell run-as $PACKAGE_NAME cp $TMP_TARGET_GDBSERVER .
+adb shell rm $TMP_TARGET_GDBSERVER
 fail_panic "Could not copy gdbserver to the device!"
 
 PORT=5039