[Android] Add lint as a gyp action.

build/android/gyp/util/build_utils.py

Index: build/android/gyp/util/build_utils.py
diff --git a/build/android/gyp/util/build_utils.py b/build/android/gyp/util/build_utils.py
index a58fe4a715e552a4a70b0c57a4aee013489f1b5d..1214bbae6566de16de54cc65c88a83f53c4e6d3d 100644
--- a/build/android/gyp/util/build_utils.py
+++ b/build/android/gyp/util/build_utils.py
@@ -78,12 +78,7 @@ def ReadJson(path):
     return json.load(jsonfile)
 
 
-# This can be used in most cases like subprocess.check_call. The output,
-# particularly when the command fails, better highlights the command's failure.
-# This call will directly exit on a failure in the subprocess so that no python
-# stacktrace is printed after the output of the failed command (and will
-# instead print a python stack trace before the output of the failed command)
-def CheckCallDie(args, suppress_output=False, cwd=None, fail_if_stderr=False):
+def CheckCall(args, suppress_output=False, cwd=None, fail_if_stderr=False):
   if not cwd:
     cwd = os.getcwd()
 
@@ -111,16 +106,30 @@ def CheckCallDie(args, suppress_output=False, cwd=None, fail_if_stderr=False):
     if stderr:
       print >> sys.stderr, stderr,
 
-    # Directly exit to avoid printing stacktrace.
-    sys.exit(returncode)
-
   else:
     if not suppress_output:
       if stdout:
         print stdout,
       if stderr:
         print >> sys.stderr, stderr,
-    return stdout + stderr
+
+  return (returncode, stdout + stderr)
+
+
+# This can be used in most cases like subprocess.check_call. The output,
+# particularly when the command fails, better highlights the command's failure.
+# This call will directly exit on a failure in the subprocess so that no python
+# stacktrace is printed after the output of the failed command (and will
+# instead print a python stack trace before the output of the failed command)
+def CheckCallDie(args, suppress_output=False, cwd=None, fail_if_stderr=False):
+  returncode, output = CheckCall(args, suppress_output=suppress_output, cwd=cwd,
+                                 fail_if_stderr=fail_if_stderr)
+
+  if returncode:
+    # Directly exit to avoid printing stacktrace.
+    sys.exit(returncode)
+
+  return output
 
 
 def GetModifiedTime(path):