Make clang the default Android compiler.

gyp/common_conditions.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.
 
 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
@@ skipping 602 matching lines @@
 
           # Android Text Tuning
           'SK_GAMMA_EXPONENT=1.4',
           'SK_GAMMA_CONTRAST=0.0',
         ],
         # Android defines a fixed gamma exponent instead of using SRGB
         'defines!': [
           'SK_GAMMA_SRGB',
         ],
         'configurations': {
-          'Debug': {
-            'cflags': ['-g']
-          },
           'Release': {
             'cflags': ['-O2'],
+            'conditions': [
+              [ 'skia_clang_build', {
+                'cflags!': ['-g'],
+                'cflags': [ '-gline-tables-only' ],
+              }],
+            ],
           },
         },
         'libraries': [
           '-llog',
         ],
         'cflags': [
           '-fuse-ld=gold',
         ],
         'conditions': [
           [ '"x86" in skia_arch_type', {
@@ skipping 48 matching lines @@
           'LD_RUNPATH_SEARCH_PATHS': ['@executable_path/.'],
       },
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }