generate_gradle.py: Allow multiple --target and add --all

build/android/gyp/jinja_template.py

Index: build/android/gyp/jinja_template.py
diff --git a/build/android/gyp/jinja_template.py b/build/android/gyp/jinja_template.py
index 3fa477fe654fff43a28c1b2613fe06548667b656..c8176bdd7854b02bf3f0b0c5683d3b08d71bd6df 100755
--- a/build/android/gyp/jinja_template.py
+++ b/build/android/gyp/jinja_template.py
@@ -44,10 +44,14 @@ class JinjaProcessor(object):
     self.env.line_comment_prefix = '##'
     self.env.trim_blocks = True
     self.env.lstrip_blocks = True
+    self._template_cache = {}  # Map of path -> Template
 
   def Render(self, input_filename, variables=None):
     input_rel_path = os.path.relpath(input_filename, self.loader_base_dir)
-    template = self.env.get_template(input_rel_path)
+    template = self._template_cache.get(input_rel_path)
+    if not template:
+      template = self.env.get_template(input_rel_path)
+      self._template_cache[input_rel_path] = template
     return template.render(variables or self.variables)
 
   def GetLoadedTemplates(self):