Pass -Oz flag to Clang when targeting Android.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 2452de4e01d2efdebabb121123982acd6b03daeb..19716f7edac50dd3df6dcc1e2b3953f6f01f152f 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -3741,9 +3741,17 @@
                 ],
               }],
               ['OS=="android"', {
-                'variables': {
-                  'release_optimize%': 's',
-                },
+                'conditions': [
+                  ['clang==1', {
+                    'variables': {
+                      'release_optimize%': 'z',

[pasko, 2015/04/30 15:48:48]

counter-intuitively there is another file to be tweaked:
build/android/increase_size_for_speed.gypi

+                    },
+                  }, {
+                    'variables': {
+                      'release_optimize%': 's',
+                    },
+                  }],
+                ],
               }],
               ['profiling==1', {
                 'cflags': [