Update android_make to support both --gcc and --clang options.

platform_tools/android/gyp/dependencies.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This GYP file stores the dependencies necessary to build Skia on the Android
 # platform. The OS doesn't provide many stable libraries as part of the
 # distribution so we have to build a few of them ourselves.
 #
 # NOTE: We tried adding the gyp file to the android/ directory at the root of
@@ skipping 95 matching lines @@
           # all of them).  Conditionals inside 'target_conditions' are evaluated
           # *after* all other definitions and conditionals are evaluated, so
           # we're guaranteed that '_type' will be defined when we get here.
           # For more info, see:
           # - http://code.google.com/p/gyp/wiki/InputFormatReference#Variables
           # - http://codereview.appspot.com/6353065/
           ['_type == "executable"', {
             'type': 'shared_library',
           }],
         ],
+        'cflags': [
+          '-Wno-unused-private-field',
+        ],
         'sources': [
           '../apps/sample_app/src/main/jni/com_skia_SkiaSampleRenderer.cpp',
         ],
       },
     },
     {
       # This target is a dependency for VisualBench application which runs on
       # Android.  Since Android requires us to load native code in shared
       # libraries, we need a common entry point to wrap around main(). Here
       # we also change the type of all would-be executables to be shared
@@ skipping 47 matching lines @@
           # - http://code.google.com/p/gyp/wiki/InputFormatReference#Variables
           # - http://codereview.appspot.com/6353065/
           ['_type == "executable"', {
             'type': 'shared_library',
           }],
         ],
       },
     },
   ]
 }