Bug 1411654 - Pre: Teach |mach gradle| to take GRADLE_FLAGS from the command line. r=maliu

MozReview-Commit-ID: 150llND5h0j

--HG--
extra : rebase_source : 58449c7791d76441dc0068645c7c059877f8cf05
extra : source : d276d3deba053f66d74d258d964cab3fd5358a14

mobile/android/mach_commands.py

@@ -414,7 +414,9 @@ class MachCommands(MachCommandBase):
         # $JAVA_HOME/bin/java into $JAVA_HOME.
         java_home = os.path.dirname(os.path.dirname(self.substs['JAVA']))
 
-        gradle_flags = shell_split(self.substs.get('GRADLE_FLAGS', ''))
+        gradle_flags = self.substs.get('GRADLE_FLAGS', '') or \
+                       os.environ.get('GRADLE_FLAGS', '')
+        gradle_flags = shell_split(gradle_flags)
 
         # We force the Gradle JVM to run with the UTF-8 encoding, since we
         # filter strings.xml, which is really UTF-8; the ellipsis character is