Fixes for iOS Swarming bot

BUG=skia:5155
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1855223002

Review URL: https://codereview.chromium.org/1855223002
diff --git a/platform_tools/ios/bin/ios_install b/platform_tools/ios/bin/ios_install
index 0e01429..9b8391a 100755
--- a/platform_tools/ios/bin/ios_install
+++ b/platform_tools/ios/bin/ios_install
@@ -15,5 +15,5 @@
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 source $SCRIPT_DIR/ios_setup.sh
 
-ios_umount || true 
+ios_umount || true
 ios_install_app
diff --git a/platform_tools/ios/bin/ios_ninja b/platform_tools/ios/bin/ios_ninja
index ff0a61d..a0f721a 100755
--- a/platform_tools/ios/bin/ios_ninja
+++ b/platform_tools/ios/bin/ios_ninja
@@ -14,8 +14,8 @@
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 source $SCRIPT_DIR/ios_setup.sh
 
-OLD_DIR=`pwd`
-cd ${SKIA_SRC_DIR}
+pushd ${SKIA_SRC_DIR}
 "${SKIA_SRC_DIR}/gyp_skia"
 xcodebuild -project "$SKIA_OUT/gyp/iOSShell.xcodeproj" -configuration "$BUILDTYPE"
-cd $OLD_DIR
+popd
+ios_package_app
diff --git a/platform_tools/ios/bin/ios_setup.sh b/platform_tools/ios/bin/ios_setup.sh
index dbfed7c..49a2228 100755
--- a/platform_tools/ios/bin/ios_setup.sh
+++ b/platform_tools/ios/bin/ios_setup.sh
@@ -41,19 +41,29 @@
   SKIA_OUT="$SKIA_SRC_DIR/out"
 fi 
 
+# Name of the iOS app.
+IOS_APP=iOSShell.ipa
+
+# Location of the compiled iOS app.
+IOS_APP_PATH=${SKIA_OUT}/${BUILDTYPE}/${IOS_APP}
+
+
 ios_uninstall_app() {
   ideviceinstaller -U "$IOS_BUNDLE_ID"
 }
 
-ios_install_app() {
+ios_package_app() {
   rm -rf $IOS_PCKG_DIR
   mkdir -p $IOS_PCKG_DIR/Payload  # this directory must be named 'Payload'
   cp -rf "${SKIA_SRC_DIR}/xcodebuild/${BUILDTYPE}-iphoneos/iOSShell.app" "${IOS_PCKG_DIR}/Payload/"
-  local RET_DIR=`pwd`
-  cd $IOS_PCKG_DIR
-  zip -r iOSShell.ipa Payload
-  ideviceinstaller -i ./iOSShell.ipa
-  cd $RET_DIR
+  pushd $IOS_PCKG_DIR
+  zip -r ${IOS_APP} Payload
+  cp ${IOS_APP} ${IOS_APP_PATH}
+  popd
+}
+
+ios_install_app() {
+  ideviceinstaller -i ${IOS_APP_PATH}
 }
 
 ios_rm() {