Make clang the default Android compiler.

BUG=skia:5215
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1919873003

Review URL: https://codereview.chromium.org/1919873003
diff --git a/gyp/common_conditions.gypi b/gyp/common_conditions.gypi
index 1485606..aee65da 100644
--- a/gyp/common_conditions.gypi
+++ b/gyp/common_conditions.gypi
@@ -620,11 +620,14 @@
           'SK_GAMMA_SRGB',
         ],
         'configurations': {
-          'Debug': {
-            'cflags': ['-g']
-          },
           'Release': {
             'cflags': ['-O2'],
+            'conditions': [
+              [ 'skia_clang_build', {
+                'cflags!': ['-g'],
+                'cflags': [ '-gline-tables-only' ],
+              }],
+            ],
           },
         },
         'libraries': [
diff --git a/gyp/freetype.gyp b/gyp/freetype.gyp
index f282f77..d68d33a 100644
--- a/gyp/freetype.gyp
+++ b/gyp/freetype.gyp
@@ -104,7 +104,7 @@
         }],
         [ 'skia_clang_build == 1', {
           'cflags':[
-            '-Wno-error',
+            '-w',
           ],
         }],
       ],
diff --git a/gyp/lua.gyp b/gyp/lua.gyp
index 5b160eb..9991e73 100644
--- a/gyp/lua.gyp
+++ b/gyp/lua.gyp
@@ -69,7 +69,7 @@
         ],
         [ 'skia_clang_build == 1', {
           'cflags':[
-            '-Wno-error',
+            '-w',
           ],
         }],
       ],
diff --git a/platform_tools/android/bin/android_setup.sh b/platform_tools/android/bin/android_setup.sh
index 0084fc6..ee1160e 100755
--- a/platform_tools/android/bin/android_setup.sh
+++ b/platform_tools/android/bin/android_setup.sh
@@ -12,7 +12,7 @@
 set -e
 
 BUILDTYPE=${BUILDTYPE-Debug}
-USE_CLANG="false"
+USE_CLANG="true"
 
 while (( "$#" )); do
   if [[ "$1" == "-d" ]]; then