[Android] With gyp_managed_install no device is only a warning

build/android/gyp/apk_install.py

Index: build/android/gyp/apk_install.py
diff --git a/build/android/gyp/apk_install.py b/build/android/gyp/apk_install.py
index 714be081ca14c1084284e57c66336dcd5f7e842a..9431b29df0bbad750423bdb89bb0ada6fd3bb07f 100755
--- a/build/android/gyp/apk_install.py
+++ b/build/android/gyp/apk_install.py
@@ -56,6 +56,11 @@ def RecordInstallMetadata(apk_package, metadata_path):
 
 
 def main(argv):
+  if not build_utils.IsDeviceReady():
+    build_utils.PrintBigWarning(
+        'Zero (or multiple) devices attached. Skipping APK install.')
+    return
+
   parser = optparse.OptionParser()
   parser.add_option('--android-sdk-tools',
       help='Path to Android SDK tools.')